压气机的增压比的定义是什么?它与级增压比是什么关系?
参考答案:
压气机的增压比是:压气机出口处的总压与压气机进口处的总压之比。
压气机的增压比等于各级增压比乘积。
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Did you catch the early bus this morning? No , I hurried there only _______ it had left .
A to be told B told C to tell D telling
园林施工图常用比例不含()。
A.1:100
B.1:50
C.1:200
D.1:500