动合触点即指常开触点，是指绕组通电时触点断开；绕组失电时触点闭合。（）
参考答案：错
—Could you please help me choose an Mp4 player online?
— __________. My computer doesn't work.
A. I don't care
B. I hope so
C. I'm afraid I can't
内痔好发部位主要分布有：（）
A.肛门静脉
B.直肠上静脉丛
C.直肠下静脉丛
D.髂内静脉
E.以上均不对
