單項選擇題In a series circuit, which value will remain unchanged at all places in the circuit?（）

A.Voltage
B.Current
C.Resistance
D.Inductance


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1.單項選擇題Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.

A.increase in resistance with increased temperature
B.increase in resistance with decreased temperature
C.decrease in resistance with increased temperature
D.increase in conductance with increased temperature

2.單項選擇題The function of a rectifier is similar to that of a （）.

A.trap
B.regulating valve
C.check valve
D.filter

3.單項選擇題Electrical circuits are protected against overheating by means of a/an （）.

A.circuit breaker
B.amplifier
C.diode
D.capacitor

4.單項選擇題Routine maintenance of lead acid batteries should include （）.

A.keeping the terminals clean
B.coating cable connections with petroleum jelly
C.maintaining a trickle charge
D.All of the above

5.單項選擇題Under which of the listed conditions can the engine room retake the throttle control from the bridge（）.

A.Any time it is deemed necessary
B.Only with the masters permission
C.After a 10 minute delay to the input command
D.Only after the throttle has been placed in stop