A: 仅a、b情况相同
B: a、b、c三种情况都相同
C: 仅b、c情况相同
D: 仅a、c情况相同
举一反三
- 试分析图所示的鼓轮在力或力偶的作用下，其作用效应（）的。 A: 仅a、c情况相同 B: 仅a、b情况相同 C: 仅b、c情况相同 D: a、b、c三种情况都相同
- 试分析图所示的鼓轮在力或力偶的作用下，其作用效应正确的是（ ）。[img=689x286]17d6073a349a782.png[/img] A: 仅a、b情况相同 B: a、b、c三种情况都相同 C: 仅b、c情况相同 D: 仅a、c情况相同
- 下列各对函数中，两函数相同的是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/005a115bac08495eb95962c7071a78f1.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a527471aab444488884fca1d17d9d400.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3a0e26b4b4f44ceaa2ac479ce599077d.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3430e6031b074123a928985c91d4bf44.png">
- 根据瞬时速度矢量的定义，在直角坐标系下，其大小可表示为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/216af49737494503bcc60d629711590e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/61bf4252ab7143dd963055ac61528d9d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/be254f5fb29d44669cf22d6edc9399c0.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/2692ac1ea4ef4ce3a928606065a9086c.png" />
- 下列函数中为奇函数的是( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7d0e4f5547744249b8c4c0e6db0e62fc.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d19abeb7724248dca0a0c1b8017897db.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3f5cff0b4a9b441da3b9e75bd446c141.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d59a9db29be640a899356a3f1645a0dd.png">
内容
- 0
在横截面积等其他条件均相同的条件下，压杆采用（）所示的截面形状，其稳定性最好。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/cde5a8d5534f40b890e9156e7f05ea94.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/41e79439d2fd46fca429c2663fe0bbca.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/af2d8363d9be44bd8dc3f3e96310748b.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/d427ec9070724523b4f4d924c2a2daf0.png" />
- 1
下列化合物能发生Hoffmann重排反应的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/48290165247643e1aac1067c27f0cfce.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/04103b28f4ec4c5f8d28d8f8392e143f.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/80cb1b0a7023476496199ba53a5f28f3.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/72d151e6a82943c6b11abdffa60b68c0.png" />
- 2
下列化合物中不能发生碘仿反应的是( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0dff63271c6c4de9b7f03cb96261c5dc.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/4abfad75020f40f89720a58429a59426.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/a2517651d2ba48e5be59131fd9e30a4f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/4fa29dce98f542d883f395cefd3908df.png" />
- 3
下列基团中吸电子能力最强的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/18902949ac9142beb6b84407debff192.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c5ceca45d0dc49789321fba46295c6f9.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d87661c43e124df88ce64fc1c55932b7.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/69c2916d66284096b7c7f1a2a26242da.png" />
- 4
下列情况中，会产生感应电流的有： A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/1e2e7b8e99294e8a824d5906dda51113.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/6081bc4ae79e452d904680d64f32af5a.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/655e36b2c61547b09b3411739b7ad3be.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201905/2735a230795a4cbda1a0197612327818.png" />