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【单选题】
直升机在自转下滑飞行状态中，进入下降气流，旋翼转速：A.
先增加后减小
B.
先减小后增加
C.
先增大后稳定
D.
先减小后稳定
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举一反三
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A.
comparison
B.
composition
C.
compliment
D.
component
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A.
附近恰有一辆出租车经过,随即打车前往
B.
向指挥中心报告,等待最新指令
C.
请求指挥中心调派其他警力前往,自己返回
D.
请求附近一车辆修理厂对车辆进行维修
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A.
the 1870s
B.
1870 ’ s
C.
1870s
D.
his 1870 ’ s
【单选题】In ______ Marx began to learn Russian.
A.
1870
B.
1870s
C.
the year of 1870
D.
the 1870s
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【单选题】Marx began to learn Russian by himself in _____.
A.
the fifty
B.
the fifties
C.
his fifties
D.
his fifty
【单选题】In _____ Marx began to learn Russian.
A.
a 1870
B.
the 1870
C.
the 1870’s
D.
his 1870
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