题目内容

净空道宽度与同它相联接的跑道的宽度相同。

A. 对
B. 错

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升降带必须包含跑道和停止道（若停止道有）。

A. 对
B. 错

The atmosphere is as much a part of the earth as __its soils and the water of its takes, rivers and oceans.A. are

A. are
B. is
C. do
D. has

Our company is ___ of other makers of spare parts for the airplane.

A. in advance
B. ahead
C. abreact
D. in front

设容量n=10的样本观察值为（8、7、6、9、8、7、5、9、6、5），则样本均值=,样本方差=_.

A. 7,2
B. 7,20/9
C. 70/9,2
D. 70/9,20/9