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【单选题】
一对标准直齿圆柱齿轮传动,已知齿轮1的接触应力[σH]1=300MPa,齿轮2的接触应力[σH]2=400MPa,则下列关于二者接触疲劳强度描述,正确的是( )。A.
齿轮1的接触疲劳强度较高
B.
齿轮2的接触疲劳强度较高
C.
两个齿轮的接触疲劳强度相同
D.
无法确定哪个齿轮的接触疲劳强度较高
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【单选题】How did the leader of governments opponents get away from the police?
A.
With the help of guns.
B.
With the help of their leaders.
C.
With the help of bombs.
D.
With the help of proponents.
【简答题】—How did you find the leader of the Youth League? —Well, she talks __________ she herself were an expert on the agers. Aas if B. even though C. even if ...
【简答题】电子心律起博器心率控制系统结构如图所示,其中模仿心脏的传递函数相当于一个纯积分环节, (1) 若 =0.5时,则起博器的增益 应取多大? (2) 若期望心速为60次/分钟,突然接通起博器,则瞬时最大心速是多少?
【单选题】Mike is a first-rate leader who knows how to call the ______.
A.
snaps
B.
shootings
C.
shots
D.
strokes
【单选题】----How do you find our company? ----A little worried. We _________ ground as a leader in the field of IT with the others speeding up development.
A.
have lost
B.
are losing
C.
lost
D.
were losing
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