A: -2P
B: 0
C: -P
D: P
举一反三
- 图示桁架结构，杆件EF的轴力是（）[img=310x231]17d609282750eb3.png[/img] A: -2P B: 0 C: -P D: P
- 时序逻辑电路如下图所示，其状态方程组是。（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/75fb6bc0f79d4332b5bdc69605562aba.png" > A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/5f963aec69ea48089a47d3cea9ec8f96.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/4a0262f12d584d86a85b3d0917a539aa.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/0733702e95cb4432b6847bfa287c88cc.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/b4619d1e5055487c984ea3b0b338ee02.png" >
- 图示结构，忽略各杆件的轴向变形。已知各杆件的长度均为l，刚度均为EI，受均布荷载作用，用位移法计算时的基本体系如图所示，求出位移法方程中的系数和自由项为（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/d7f9da9f3d7d4a1ca3aacc9d78b287bc.png" /> A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/4e6dd0d1ad09433f951a2ff19b298211.png"/>； B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/3b01d536637e445e841b61e5a9fa3506.png"/>。 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/0969ea96f00849a09cccad36566fbf50.png"/>； D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/f03eca36624f4c51aff26a8015294edc.png"/>；
- 图示结构考虑轴向变形，BC杆件可看作连续梁单元（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/1c7dbf43a68d4a8ca4fe3828bb49ba56.png" />
- 图示桁架结构杆①的轴力为：（） A: -P/2 B: P C: 3/2P D: 2P
内容
- 0
用三线-八线译码器74LS138和辅助门电路实现逻辑函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/c871492b27384497a59d367211b93efb.png" >，应：（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/37b75181b0ad4fba92ee10f87ffa0bbb.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/453b2c724d1d4d41898e10c9ba036a39.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/2c10ee737f77406fa0457e0f02318515.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/9cbe3266526b4e8eab204cf96440be55.png" >
- 1
<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/9e1758fc408642e5b65ad96005c5343d.png" />用力法计算图示桁架结构，并求指定杆件的内力。已知各杆EA=常数。下列选项正确的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/381351aae1e343d4a83378d50dfb3f3f.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e303b05f137d4f8b8f9e731cef7dbb5e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/604c205bceef42009d1bd9e598022a20.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202012/e5d7282c479e40539d88dc09d897d256.png" />
- 2
下列几个方程，表示质点振动为“拍”现象的是：（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/9667dbfe77314804a8c29f40c44cd0eb.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/c7bc921fc7c04ce6832fea3a190e7d8d.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/87e37e83ce244721905379b745be2bba.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/026e1391030345459a10867db4150d25.png">
- 3
钢号Q345A中的345表示钢材的（）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/af6807e52a454663a6eaf1728a03a050.png" >值 B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/3cf447dcca4b4032bf4df7ef7b7a8f7f.png" >值 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/390a6cad6f4746668ba550f409ead899.png" >值 D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/f0782fccfc8047bb9aea1b0934a4dfed.png" >值
- 4
图示桁架结构，杆件BE的轴力是（ ）[img=319x268]1786a08f5eea25f.png[/img] A: -2P B: -P C: 0 D: P