你可能感興趣的試題

Which of the following statements concerning energy is correct?（）

A.Energy can be created or destroyed
B.Energy may not be transformed
C.The total quantity of energy in the universe is always the same
D.None of the above

單項(xiàng)選擇題

In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.

A.evaporator
B.compressor
C.expansion valve
D.condenser

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By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）

你可能感興趣的試題

Which of the following statements concerning energy is correct?（）

In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the（）.

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