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【简答题】

John needs help preparing for his __ .

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参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】The turbulent drag is ____ to the laminar drag.

A.
2 to 4 times
B.
3 to 5 times
C.
4 to 6 times
D.
5 to 7 times

【多选题】The main methods of laminar flow control include: ____.

A.
Changing the wing’s configuration
B.
Breath air at the wing’s leading edge
C.
Breath air at the wing’s lower surface
D.
Breath air at the wing’s upper surface

【多选题】关于材料力学研究对象的描述,正确的是

A.
宏观尺度内
B.
变形的杆件
C.
弹性范围内的小变形
D.
连续、均匀、各向同性的材料