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【单选题】
自行车的前轴属于A.
固定心轴
B.
转动心轴
C.
传动轴
D.
转轴
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反馈参考答案：
举一反三
【简答题】用定义求下列函数的拉氏变换： (1)f(t)=e -2t (2)lf(t)=2t
【单选题】Why isnt it important what McKay sees in the machine?
A.
He doesn't like the machine.
B.
An eye chart is better.
C.
It's what the machine sees in him that is important.
D.
The prototype doesn't work very well.
【简答题】What should you do if a machine jams
【单选题】—We've waited for the two singers for two hours. Will they be able to come here? —I'm afraid ____ of them will come today. [ ]
A.
neither
B.
either
C.
both
D.
none
【单选题】—I've not finished with my dinner yet. —But our friends______for us.
A.
waited
B.
to be waited
C.
waiting
D.
are waiting
【单选题】---Did you wait for him long? ---No, I hadn’t waited long _______ he appeared.
A.
unless
B.
until
C.
before
D.
since
【简答题】用定义求下列函数的拉氏变换： (1)f(t)=e -2t (2)lf(t)=2t
【单选题】( 浙江卷 )6. This machine _______. It hasn’t worked foryears.
A.
didn’t work
B.
wasn’t working
C.
doesn’twork
D.
isn’t working
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