單項選擇題This new method not only saves time but also saves energy()operating on two batteries instead of four.

A.in
B.by
C.on
D.for


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3.單項選擇題To determine if a C02 fire extinguisher is fully charged, you would().

A.operate the trigger valve
B.weigh the extinguisher
C.test with a pressure gauge
D.read the date of last test

4.單項選擇題To ensure the ship’s general stability,().

A.she's loaded a little deeper forward
B.she's loaded a little deeper aft
C.she has not any ballast at all
D.the cargo is properly distributed throughout the ship