皮皮学，免费搜题
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搜题
【单选题】
摩擦表面材料微观体积受循环接触应力作用产生重复变形,导致产生裂纹和分离出微片或颗粒的磨损称为( )。A.
机械磨损
B.
疲劳磨损
C.
腐蚀磨损
D.
微动磨损
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
举一反三
【单选题】Mr. Smith ________me to buy several eggs for dinner.
A.
had
B.
suggested
C.
asked
D.
made
【简答题】窦房结作为心脏正常起搏点的原因是其P细胞( )
【单选题】It was at the very beginning ______ Mr Smith made a decision _____we should send for a doctor.
A.
when; which
B.
that; which
C.
when; that
D.
that; that
【单选题】_______ was at the end of the meeting that Mr. Smith made the decision .
A.
This
B.
It
C.
That
D.
不填