农业作业飞行时，直升机旋翼距山坡的水平距离不得小于旋翼直径的_爱下问搜题

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问题单项选择题

农业作业飞行时，直升机旋翼距山坡的水平距离不得小于旋翼直径的（）倍。

A.1

B.1.5

C.2

D.2.5

答案

参考答案：B

阅读理解

B

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A. master at least three languages                        B. know the city very well
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单项选择题

根据需求指向理论，城市经济增长取决于( )。

A．投资的增长

B．城市消费的增长

C．城市出口的增长

D．资本流入的增长