皮皮学，免费搜题
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【判断题】
一对标准齿轮传动,若其安装中心距比标准中心距大时,其分度圆的压力角也随之变大A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Who volunteered to clean up the oil
A.
Business people, storekeepers and students
B.
Storekeepers, reporters and business people
C.
Farmers, scientists and teachers
【简答题】innovation
【单选题】Who will clean up the cat's ___ in the bedroom?
A.
confusion
B.
disorder
C.
muddle
D.
mess
【单选题】— The floor is clean and dry now. Who _______? — Sorry, I don’t know.
A.
mopped it up
B.
has mopped it up
C.
has mopped up it
D.
mopped up it
【单选题】Your bedroom is very dirty. You must _____. [ ]
A.
clean up it
B.
clean it up
C.
clean them up
D.
clean up them
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