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作为支付手段被普遍接受的任何商品或者标志的是。一个在产品和服务交易时被普遍接受的东西是(计价单位；价值储藏；交易媒介)。(计价单位；价值储藏；交易媒介)是公认的表示产品和服务价格的衡量标准。(计价单位；价值储藏；交易媒介)是能够被持有并用来以后交换产品和服务的任何商品或符号。银行的现金(是；不是)货币，银行外的现金(是；不是)货币。信用卡(是；不是)货币。M1(多于；少于)M2。支票账户存款(属于；不属于)M1，储蓄存款(属于；不属于)M1。

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The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause？

A. Faulty thermostatic bypass valve
B. Eroded zinc pencils in the heat exchanger
C. Steam formation in the expansion tank
D. Excessive leakage from jacket water pump seals

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Springs in fuel injectors will become not strong enough to work because______.

A. the injector opens at a lower pressure than designed
B. the needle valve and seat wear out
C. the nozzle holes wear out
D. long time in use

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Which of the following devices is a common basic element with nearly all mechanical governors？

A. Power piston
B. Control rack
C. Weights acted on by centrifugal force
D. Isochronous（同步的）droop spring

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Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive the life of the ship.

A. along
B. with
C. throughout
D. for

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