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【简答题】
已知一标准渐开线直齿圆柱齿轮,其齿顶圆直径 d a1 =77.5mm ,齿数 z 1 =29 ,现要求设计一个大齿轮与其相啮合,传动的安装中心距 a =145mm ,试计算这对齿轮的主要参数及主要尺寸。
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【单选题】Bravery is as rare in war as it is in peace. It isn't just a matter of facing danger from which you would ______ to run.
A.
prefer
B.
infer
C.
refer
D.
offer
【简答题】在核算厨房生产人员数量时,如果按照工作量来确定,主要以劳动定额为基础,应重点考虑()厨师。
【单选题】Don’t be nervous. Just speak _______ and pretend the microphone isn’t here.
A.
obviously
B.
slightly
C.
naturally
D.
strangely
【单选题】I suppose that he is just joking, ______?
A.
don't I
B.
isn't he
C.
isn't it
D.
is it
【单选题】It just isn’t fair____________I was working as a waiter last month；my friends were lying on the beach．
A.
whenever
B.
though
C.
for
D.
while
【简答题】It just isn’t fair I was working as a waiter last month my friendswere lying on the beach. . A whenever B.though C.for D.while
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