题目内容

We need about 18 minutes to______ before coming in for the approach.

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We have a _________and cannot start our APU at this altitude. Request __________.

We still cannot___________. Our approach speed will be higher than normal. Request _____________

We’ve made a________of engine Number Two from the cabin. The __________has fallen off

心血管的最基本中枢位于

A. 脊髓
B. 延髓
C. 端脑
D. 中脑

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