题目内容

Which dimension decides output torque of a hydraulic piston motor?

A. motor diameter
B. piston length
C. piston diameter
D. all of the above

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High speed hydraulic motors usually provide low torque.

A. 对
B. 错

______is the device that provides amplification(the increase in current, voltage, or power of a signal)without appreciably altering the original signal.

A. analog
B. digital circuit
C. amplifier
D. power supplier

In the common-emitter circuit, the base terminal of the transistor serves as the input, the collector is the output, and the______is common to both.

A. base
B. emitter
C. substance
D. collector

If there is no voltage gain, but the output power is greater than the input power, the amplifier is a _______ amplifier.

A. voltage
B. power
C. transistor
D. operational