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【单选题】
蒸汽在叶片斜切部分膨胀的特点包括A.
蒸汽汽流方向不变
B.
其叶片前后的压力比ε＜εcr
C.
其叶片前后的压力比ε＞εcr
D.
叶片出口只能得到音速汽流
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A.
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B.
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C.
would I make
D.
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A.
for
B.
since
C.
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D.
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