流线型舵的缺点是（）。Ⅰ.结构复杂；Ⅱ.舵效低；Ⅲ.造价高；Ⅳ._爱下问搜题

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问题单项选择题

流线型舵的缺点是（）。Ⅰ.结构复杂；Ⅱ.舵效低；Ⅲ.造价高；Ⅳ.阻力大；Ⅴ.产生的水动力小。

A.Ⅰ＋Ⅲ

B.Ⅰ＋Ⅳ＋Ⅴ

C.Ⅲ＋Ⅳ＋Ⅴ

D.Ⅰ＋Ⅲ＋Ⅳ

答案

参考答案：A

问答题简答题

机械锯轨作业程序是什么？

选择题

— By the way, have you moved into the new house?

— Not yet. The walls _____.[ ]

A. were painted

B. are being painted

C. are painted

D. are painting