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【多选题】

蒸汽在叶片斜切部分膨胀的特点包括 ()

A.
 蒸汽汽流发生偏转
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.
 叶片出口可以得到超音速汽流
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题目标签:叶片膨胀斜切
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参考解析:
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【单选题】How should one invest a sum of money in these days of inflation (通货膨胀) Left in a bank it will hardly keep its value, however high the interest rate is. Only a brave man, or a very rich one, dares to b...

A.
suggest human beings are controlled by a clock
B.
describe why clocks can rule the planet Earth
C.
tell readers what clocks look like
D.
compare clicks to human beings

【单选题】叶片薄而透明呈膜质的植物是

A.
薄荷
B.
天蓝星
C.
半夏
D.
枇杷
E.
马齿笕