下列关于劳氏肉瘤病毒 v-src 基因的叙述正确的是（ ）。 A: v-src不是最早被研究的癌基因 B: v-src 与禽类细胞中的c-src 具有相同的序列 C: v-src 编码的蛋白质具有激酶活性 D: v-src 能够增强宿主细胞的黏附能力
下列关于劳氏肉瘤病毒 v-src 基因的叙述正确的是（ ）。 A: v-src不是最早被研究的癌基因 B: v-src 与禽类细胞中的c-src 具有相同的序列 C: v-src 编码的蛋白质具有激酶活性 D: v-src 能够增强宿主细胞的黏附能力
下面哪个基因是原癌基因 A: . v-src B: . SV40 C: . c-src D: . ALV
下面哪个基因是原癌基因 A: . v-src B: . SV40 C: . c-src D: . ALV
属于病毒癌基因的是: A: v-src B: v-ras C: c-src D: p53 E: EGF
属于病毒癌基因的是: A: v-src B: v-ras C: c-src D: p53 E: EGF
质量分别为mA和mB (mA＞mB)、速度分别为v A和v B (v A＞ vB)的两质点A和B，受到相同的冲量作用，则（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/7c2b3862242c4bf4b3a64bf1fa09daec.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b0bbdbc764f048948464f2bcdbaf296e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/bb33c399a0bf42cbb2b3b1751d9a944a.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/f2a63edf321e4927bcd918849fbb2e95.png" />
质量分别为mA和mB (mA＞mB)、速度分别为v A和v B (v A＞ vB)的两质点A和B，受到相同的冲量作用，则（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/7c2b3862242c4bf4b3a64bf1fa09daec.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b0bbdbc764f048948464f2bcdbaf296e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/bb33c399a0bf42cbb2b3b1751d9a944a.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/f2a63edf321e4927bcd918849fbb2e95.png" />
流体运动粘度v的量纲是( )。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6ba52cc0037d454aae5499e942e8c40c.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/389803a418394b09a61bcbe7861b0ef8.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6ff59473ff7d475887d5e18dec32f15c.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/34ebc629c74a431bb5c03df0f1dcb656.png" />
流体运动粘度v的量纲是( )。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6ba52cc0037d454aae5499e942e8c40c.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/389803a418394b09a61bcbe7861b0ef8.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/6ff59473ff7d475887d5e18dec32f15c.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/34ebc629c74a431bb5c03df0f1dcb656.png" />
在体积V内理想气体的配分函数是（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f06f3edbc1e2490db16ddf913dd8567e.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f3bd5d2ed5784896920511b072867fb2.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/daf559fcf21a48b584a41773e83704ef.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/50e30867ae3f46e2b36a482a15bc0c39.png" />
在体积V内理想气体的配分函数是（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f06f3edbc1e2490db16ddf913dd8567e.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f3bd5d2ed5784896920511b072867fb2.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/daf559fcf21a48b584a41773e83704ef.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/50e30867ae3f46e2b36a482a15bc0c39.png" />
正弦量<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202010/68b98b53108b4a51b29f59187058b7a0.png" /> ，则其有效值为（ ）V。 A: 200 B: 100 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202010/d95db06d7d764c4a994bf3d58764f20e.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202010/fd77773fbd7343ec9ed61fac95727df5.png" />
正弦量<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202010/68b98b53108b4a51b29f59187058b7a0.png" /> ，则其有效值为（ ）V。 A: 200 B: 100 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202010/d95db06d7d764c4a994bf3d58764f20e.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202010/fd77773fbd7343ec9ed61fac95727df5.png" />
杆AB的两端可分别沿水平，铅直滑道运动，已知B端的速度为v<sub>B</sub>，则图示瞬时B点相对于A点的速度为___________。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/94cd2eb3fc9b437fa63cd22c2319a049.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/4d1e266b04924baa9e49e920a3d43bc9.png" /> B: v<sub>B</sub>sinq C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/8896f5b80f9d4131a7a2309a447dbc05.png" /> D: v<sub>B</sub>cosq
杆AB的两端可分别沿水平，铅直滑道运动，已知B端的速度为v<sub>B</sub>，则图示瞬时B点相对于A点的速度为___________。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/94cd2eb3fc9b437fa63cd22c2319a049.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/4d1e266b04924baa9e49e920a3d43bc9.png" /> B: v<sub>B</sub>sinq C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/8896f5b80f9d4131a7a2309a447dbc05.png" /> D: v<sub>B</sub>cosq
如下电路图所示，计算电路图中的Uab= V。[img src="https://file.icve.com.cn/ssykt/159/92/27D1703833BA6D34862056DFEE50AE69.png"]
如下电路图所示，计算电路图中的Uab= V。[img src="https://file.icve.com.cn/ssykt/159/92/27D1703833BA6D34862056DFEE50AE69.png"]
图示电路中，已知电流源<img src="http://edu-image.nosdn.127.net/85902C91DE56CAB93E99D0255A23B10D.JPG?imageView&thumbnail=520x520&quality=100" />互感M=1H，a、b两端的开路电压为 ; ;;V。<br ><img src="http://edu-image.nosdn.127.net/C852E58D8231E03C27740A58A548D688.JPG?imageView&thumbnail=520x520&quality=100" />?
图示电路中，已知电流源<img src="http://edu-image.nosdn.127.net/85902C91DE56CAB93E99D0255A23B10D.JPG?imageView&thumbnail=520x520&quality=100" />互感M=1H，a、b两端的开路电压为 ; ;;V。<br ><img src="http://edu-image.nosdn.127.net/C852E58D8231E03C27740A58A548D688.JPG?imageView&thumbnail=520x520&quality=100" />?