题目内容

Lesson 23 短听力选择-2

A. controlling problem
B. engine problem
C. wake turbulence
D. radar failure

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Lesson 23 短听力选择-3

A. precautionary landing
B. normal landing
C. belly landing
D. crash landing

Lesson 23 短听力选择-4

A. Descending immediately
B. Coming back for landing
C. Making priority landing
Doing the checklist

Lesson 23 短听力选择-5

A. Foreign object ingestion
B. Engine shut-down
C. Engine disintegrated
D. Engine power loss

适合进行染色体的数目、结构等细胞遗传学研究的有丝分裂阶段是

A. 前期
B. 中期
C. 后期
D. 末期