153.斜盘式柱塞泵工作中既不转动又不连续往复运动的零件是_____ 。
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1.溢流节流阀和调速阀相比______。
A. 流量稳定性较好,经济性也较好
B. 流量稳定性较差,经济性也较差
C. 流量稳定性较好,但经济性较差
D. 流量稳定性较差,但经济性较好
She ________ the forests and fields, glad to be able to take her time.
A. hurried
B. marched
C. wandered
D. progressed
The manager speaks ________of him because he is a faithful employee.
A. right
B. well
C. good
D. satisfactory
He came at a time ________I last expected.
A. when
B. as
C. while
D. as soon as