问题
名词解释
临界M数
答案
参考答案：
当飞行速度达到某一速度，翼型表面最低压力点的气流速度等于该点的局部音速，这时的飞行M数叫临界M数。
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临界M数
参考答案：
当飞行速度达到某一速度，翼型表面最低压力点的气流速度等于该点的局部音速，这时的飞行M数叫临界M数。
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| Look! This is a photo of my 1 . These are my 2 . My father is a teacher and my mother is a worker. I have an elder sister. 3 name is Mary. She is fourteen. I am 4 . We are in the same school. My sister likes 5 very much. She has many sports things. She has a tennis racket, three 6 , two basketballs, four ping-pong bats and five ping-pong balls. We often watch basketball games 7 TV on Saturdays. What's my favourite sport? Can you guess? Yes, it's 8 I 9 basketball after school every day. 10 my mother doesn't like basketball. She thinks it's boring. | ||||
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