【单选题】注塑机的操作主要包括 ( ) 、 开车和停车几个步骤。
【单选题】下面有关静电现象的解释,说法 错误 的是
A.
接触起电的实质是一个物体的电子转移到另一个物体上
B.
静电感应不是创造电荷,只是电荷从物体的一部分转移到另一部分
C.
摩擦起电时,一个物体失去电子而带正电,另一个物体得到电子而带负电
D.
摩擦起电是在摩擦的过程中分别创造了正电荷与负电荷
【单选题】I'm quite interested in Spanish history, the civil war in Spain _______. [ ]
【单选题】听力原文:W: I guess I'll send Mark a postcard from Spain when I go there on my vacation. M: I'm sure that he'd be glad to get one. He has a collection of cards from all over the world. Q: What do we learn...
A.
Mark is going to Spain.
B.
Mark has traveled all over the world.
C.
Mark has the habit of collecting postcards.
D.
Mark is going on vacation.