【单选题】What does the man mean?
B.
He does not know what to do.
C.
He does not know what to say.
【简答题】A.He does not know who Alice is. B.He has found a job as a messenger. C.He does not want to deliver the note. D.He does not know who Alice is.
【单选题】按GB/T 1804-2000的规定,未注公差线性尺寸的一般公差的公差等级分为( )。
【判断题】装船机行走机构主要由行走支撑装置、行走驱动装置、行走安全装置三部分组成。( )
【判断题】What’s proper in one place may be improper in another place.