主机油泵出口管路强烈振动现象的主要原因是:该管路内油压发生()。
A. 高频脉动
B. 低频脉动
C. 突然变高
D. 突然变低
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喷油泵柱塞偶件的配合间隙为()。
A. 0.01~0.02mm
B. 0.003~0.005mm
C. 0.03~0.05mm
D. 0.001~0.002mm
I’d love to have a break, but I can't () the time now.
A. spare
B. spend
C. speak
The teacher showed the students () the laboratory.
A. on
B. at
C. around