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【单选题】
齿轮传动中,为了减小动载荷系数,可采取的措施有________。A.
提高齿轮的制造精度
B.
减小齿轮的平均单位载荷
C.
减小外加载和的变化幅度
D.
降低齿轮的圆周速度
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举一反三
【单选题】To get a better view of the stage, ____________________.
A.
our seats had to be changed.
B.
our seats were changed
C.
our seats are changed
D.
we had to change our seats.
【单选题】1151差压变送器采用可变电容作为敏感元件，当差压增加时，测量膜片发生位移，于是低压侧的电容量（），高压侧的电容量（）。
A.
增加、增加
B.
减少、增加
C.
增加、减少
D.
减少、减少
【单选题】Though we don't know what is discussed, yet we can feel the topic _______. [ ]
A.
had changed
B.
will change
C.
was changed
D.
has been changed
【单选题】Had we not changed our reservations, we _______ in the crash.
A.
were all killed
B.
had all killed
C.
should all be killed
D.
should all have been killed
【单选题】—What do you think of the meal we have just had? —It is well worth ______ is changed for it.
A.
that
B.
what
C.
which
D.
how many
【单选题】We hadn’t seen each other for years and he had changed a great deal, so I didn’t _______ him at first.
A.
realize
B.
repeat
C.
know
D.
rec ognize
【单选题】To get a better view of the stage, _________________ .
A.
our seats had to be changed
B.
we had to change our seats
C.
our seats were changed
D.
our seats will be changed by us
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