下列化合物属于叔胺的为
A: B
B: D
C: C
D: A
A: B
B: D
C: C
D: A
举一反三
- 下列哪种情况属于存在序列相关 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/7677353003d1437481e2ce756c2ca461.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/e1c5942e7b8f4e3688783b6ad39f04cd.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/3d41ccb91db349c3b684656f44e58cb9.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/c948f65d5ab942b2abbf34bf5e141e26.png" />
- 下列系统中，_______是线性的。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/69188060fb4c48d68700d5224ce70e53.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/66e06f948fa34740a90a8c1cc227c6b6.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/4c264641de7b410e873171e90fd444ef.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/a3f710b25c2248b48ed5f6f1d342c078.png" />
- 下列信号中，____是能量信号。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/e8fc82c3d7b046fc949119acef31f0f0.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/6085f08fa59b45e0ac501f77d9e9ac5c.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/450d1385152b4c67a5ec0e2e7a8f50d7.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/7a668260d2ea405ea903fc344f3ea5bc.png">
- 下列信号中，_____周期信号。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/5f333529a6724b348f3719d4ad9cb2a7.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/baaca1beb7ea457eaf7544beec0fa639.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/2a8d2203eb2948ce8d95e650e32130f2.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/a2d52c07e1c54524b53b98cd92d39815.png">
- 下列信号中，______是因果信号。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/56c3db40bb36428688799a6164924c2b.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/c775ed12f5af47549261ce4b9ae7c969.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/1a1575aacbdf4e95882a87cf2a5a7049.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201912/48b1a932dc504373ab3bf0e87edb513a.png">