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【单选题】
D类空域内，仪表飞行，放行同速度的航空器，航迹差大于45度，并在起飞后立即实行侧向间隔的最低间隔标准为（）分钟。A.
2
B.
3
C.
4
D.
5
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举一反三
【单选题】( ) 5. — Did you see a man in black pass by just now? — No, sir. I _______ my car. C.was washing
A.
wash
B.
washed
C.
was washing
【单选题】This washing machine is______ to the other washing machines on the market.
A.
super
B.
advantageous
C.
superior
D.
beneficial
【单选题】下列关于置位指令的说法,正确的是( )。
A.
当使能输入端接通时，置位指令接通。
B.
置位指令接通，则只有指定地址一个信号被置位。
C.
置位信号只能保持一个扫描周期。
D.
当使能输入端断开时，置位信号被复位。
【单选题】She has to help her mother ______. [ ]
A.
doing washing
B.
washing
C.
for the washing
D.
with the washing
【单选题】Many people still prefer washing dishes by hand to machine washing because ______.
A.
hand-washed dishes are cleaner
B.
dishwashers are not so easily handled
C.
some dishes cannot be machine-washed
D.
washing dishes by hand is cheaper
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