你可能感興趣的試題

Which of the listed statements is correct concerning refrigeration systems?（）

A.Dehydrators must be used continuously in a refrigeration system
B.A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C.A thermostatic expansion valve is used to control refrigerated space temperature
D.The liquid receiver functions to collect and remove non- condensable gases

單項(xiàng)選擇題

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

A.Hydraulic
B.Mechanical
C.Pneumatic
D.Electrical

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When the vessels steering wheel on the navigation bridge is turned, the difference existing between the position of the wheel and that of the rudder is known as （）.

你可能感興趣的試題

Which of the listed statements is correct concerning refrigeration systems?（）

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