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【单选题】
短波段无线电波具有许多特点，下面哪一种描述是错误的_____。A.
短波的电波波长为10—100m
B.
沿地面传播时，衰减很快
C.
天波作用距离较远
D.
电离层对电波的衰减与频率无关
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举一反三
【单选题】It's high time you had your hair cut; it's getting _____. [ ]
A.
too much long
B.
much too long
C.
long too much
D.
too long much
【多选题】块煤重介的介质用介质泵供给,分两路进入分选槽,它们的作用各是什么?
A.
保证分选压力
B.
随原煤水平进入的介质起润湿作用。
C.
随原煤水平进入的介质起水平推送作用。
D.
从分选槽底部给入的上升流起防止介质沉淀的作用，并将重产物裹挟的轻产物冲起。
【单选题】Iraq has _____ too many wars since 1990s, making his people _____ a lot. [ ]
A.
got through; pay
B.
looked through; face
C.
gone through; suffer
D.
passed through; destroy
【单选题】— Would you please go out for a walk with us? — ____, but I'm too busy now. [ ]
A.
That's OK
B.
I'd love to
C.
Of course not
D.
I'd like to
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