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單項(xiàng)選擇題

To avoid impingement attack, care must be taken with the water （） through the tubes of the heat exchangers.

A.temperature
B.velocity
C.density
D.viscosity

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單項(xiàng)選擇題

A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity

單項(xiàng)選擇題

A （） in the air delivery line near to each compressor is essential.

A.butterfly valve
B.globe valve
C.gate valve
D.non-return valve

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