下面哪种速度反映了飞机所受空气动力的情况（）？A.真空速 B._爱下问搜题

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问题单项选择题

下面哪种速度反映了飞机所受空气动力的情况（）？

A.真空速

B.指示空速

C.修正空速

答案

参考答案：B

阅读理解

阅读小天地。根据表格内容判断下列句子的正(√)误(×)。

Name	Watch TV	Read books	Play on the computer	Play cards
Jenny	○	□	△	∕
Lynn	∕	△	○	□
Bob	△	∕	□	○

○ = always □ = usually △ = sometimes ∕ = never

( ) 1. Jenny usually watches TV.
( ) 2. Jenny and Lynn never play cards.
( ) 3. Lynn always plays on the computer.
( ) 4. Bob always plays cards.
( ) 5. Lynn never reads books.

问答题简答题

测定石油产品凝点前，对试样加热有什么要求；为什么？