皮皮学，免费搜题
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【单选题】
氨基酸含量比较丰富的粮食品种是( )。A.
小米
B.
玉米
C.
荞麦
D.
高梁
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皮皮学刷刷变学霸
举一反三
【单选题】The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure _____.
A.
an adequate supply of lube oil
B.
an adequate supply of fuel oil
C.
an adequate supply of turbine oil
D.
an adequate supply of cylinder oil
【简答题】刀具补偿分为长度补偿和( )。
【单选题】To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _____.
A.
pump must always be primed
B.
volute must impart a radial and rotary motion of the water suction side
C.
connection must guide the liquid to the lantern rings
D.
stuffing box should not be allowed any water leakage
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