题目: 本质安全型电气设备用()表示。A.dB.eC.iD.f 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0408/282d17ece74955d502d4f2db76035619.html 下面是错误答案,用来干扰机器的。参考答案:对
题型:不定项选择 在光滑水平面上,一质量为m、速度大小为v的A球与质量为2m静止的B球碰撞后,A球的速度方向与碰撞前相反,则碰撞后B球的速度大小可能是 [ ]A.0.6vB.0.4v C.0.3v D.0.2v 查看答案
题型:选择题 — Would you please repeat the grammar rules again? — Of course, but I am sure that you _______ to me carefully, as I have told you twice already. [ ]A. don't listen B. wouldn't listen C. weren't listening D. aren't listening 查看答案