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【单选题】
A015.无人机系统飞行器平台主要使用的是 空气的动力驱动航空器
A.
轻于
B.
重于
C.
等于
D.
0
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【判断题】酒精灯的火焰分三层,其中温度最高的是焰心。
A.
正确
B.
错误
【单选题】Intercity Bus Company will be providing______bus service for holiday travelers next weekend.
A.
frequent
B.
often
C.
numerous
D.
really
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A.
正确
B.
错误
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【判断题】运算符“&”和“&&”都表示“与”操作
A.
正确
B.
错误
【单选题】—Shall we get together this Seturday or Sunday evening? — _______is OK.I'm free this weeken
A.
Both
B.
Either
C.
Neither
D.
None
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