题目内容

Compared with mechanical transmission, advantages of hydraulic transmission includes ().

A. high efficiency
B. low machining accuracy required
C. accurate transmission ratio can be obtained
D. smooth movement

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In the composition of the hydraulic system, the hydraulic cylinder belongs to ().

A. power elements
B. actuators
C. control elements
D. transmission elements

Which one can realize wide range continuous variable tansmission during operation? ()

A. mechanical transmission
B. electric drive
C. pneumatic transmission
D. hydraulic transmission

In hydraulic transmission, the ___________ of the hydraulic cylinder is determined by input flow rate. ()

A. pressure
B. load
C. speed
D. displacement

In hydraulic transmission, in the international system of units, the unit of pressure is ().

A. Pa
B. N
C. w
D. Nm