皮皮学，免费搜题
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【单选题】
齿轮传动中,轮齿的齿面疲劳点蚀通常首先发生在 。A.
齿顶部分
B.
靠近节线的齿顶部分
C.
齿根部分
D.
靠近节线的齿根部分
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】门极可关断晶闸管、大功率晶体管、功率场效应晶体管和绝缘栅双极晶体管按顺序其英文缩写分别是( )( )( )和( ) 。(按照顺序用“、”分开)
【单选题】听力原文：M: Hey, Sue. I was wondering if you could fill me in on Monday's class. I had to go the dentist's for an emergency and I missed Prof. Smith's lecture(19). What was it on? W: It was pretty interes...
A.
He disliked the topic of the lecture.
B.
He didn't want to go to the lecture.
C.
He thought the professor was not famous.
D.
He wasn't present at the lecture.
【简答题】每台机器重520千克，5台机器能一次运走吗？