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【多选题】
将厚度为32mm的Q345R钢板卷制成内径为2000mm的圆筒,可以采取( )方法卷制。A.
低温弯卷
B.
冷弯卷
C.
温弯卷
D.
热弯卷
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皮皮学刷刷变学霸
举一反三
【单选题】To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in __________.
A.
less piston slap and quieter running
B.
increased crankshaft bearing wear
C.
slightly greater piston wear
D.
decreased side pressures
【简答题】Due to this limit, what happen to the early German gas turbine engines?
【简答题】飞机按发动机分:涡轮喷气式飞机、涡轮风扇式飞机、__等。