Which of the listed devices may be used as a digital device?
A. variable resistor
B. diode
C. strain gauge
D. thermistor
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Because the circulating water is in a closed loop,_______is installed to cater for expansion and contraction of the water at different conditions of operation.
A. an expansion joint
B. a drain tank
C. a head tank
D. a contraction tank
航空运输是指航空承运人按照()要求,将旅客或货物由一地运抵另一地的过程。
A. 运输合同
B. 客票
C. 货单
D. 机票
美联储在什么情况下提高联邦基金率?
A. 担心经济衰退
B. 希望增加货币量
C. 担心通货膨胀
D. 希望鼓励银行借贷
E. 不能该货币量
美联储是如何让公众知晓经济状况以及其货币政策决策的?