A.鼓励类
B.限制类
C.禁止类
D.淘汰类
第4题
A.可恢复压降增大,永久压降增大;
B.可恢复压降增大,永久压降减小;
C.可恢复压降减小,永久压降增大;
D.可恢复压降减小,永久压降减小。
第6题
A、消耗于摩阻的压降Pressure drop consumed by friction;
B、气体上升克服高差的压降The rise of gas overcomes the pressure drop of height difference;
C、流速增大引起的压降The rise of gas overcomes the pressure drop of height difference
D、气体内摩擦造成的压降Pressure drop due to internal friction of a gas
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