“How did you learn to drive?” “My father ___________ me.”
A. teaches
B. teach
C. taught
D. was teaching
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Don’t put the dictionary away. I ___________ it.
A. need
B. am needing
C. was needing
D. needed
对于余隙容积、工作容积、气缸内总容积,下列说法正确的是( )
A. 气缸内总容积=工作容积+余隙容积
B. 工作容积为活塞扫过的容积
C. 余隙容积大于工作容积
往复压缩机的工作腔部分,不包括( )
A. 气缸
B. 气阀
C. 活塞
D. 连杆
对于双作用气缸,下列说法正确的是( )
A. 活塞两侧同时吸气和排气
B. 活塞两侧均可用于压缩气体
C. 活塞两侧同为一个工作腔
D. 活塞两侧为不同级