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【单选题】
直升机受到扰动后,其纵向运动和横向运动一般表现为。
A.
非周期衰减运动
B.
非周期发散运动
C.
周期减幅运动
D.
周期增幅运动
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】When the whole area was ______ by the flood, the government sent food there by helicopter (直升机).
A.
cut away
B.
cut off
C.
cut up
D.
cut down
【单选题】When the whole area was______by the flood, the government sent food there by [heli copter] (直升机).
A.
cut away
B.
cut off
C.
cut up
D.
cut down