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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At least ___ cylinders in four--stroke engine will be configured to ensure that the engine
A. 6
B. 2
C. 12
D. 8
Before performing any maintenance on a hydraulic system storing energy in an accumulator,
A. pressurize the system to test for leaks
B. bleed off all pressure within the system
C. operate the machine until it reaches normal temperature
D. disconnect the pump pressure control switch
下面哪一项最好地定义了过去和现在的货币？________。
A. 现金
B. 现金加上支票存款
C. 现金加上信用卡
D. 任何作为支付手段的东西
E. 任何作为价值储藏的东西
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