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【多选题】
河流阶地的形成可能是因为( )。A.
地壳上升,河流下切
B.
地壳稳定,河流侧蚀
C.
地壳下降,河床堆积
D.
河的侵蚀和沉积共同作用
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举一反三
【简答题】Radar is used to extend the ________ of man’s sense of observing his environment, especially the sense of vision. A) validity B) liability C) capability D) intensity
【单选题】____ radar is to airplanes and ships, ______ eyes are to human's body.
A.
Such...as
B.
Just...as
C.
Such as...so
D.
Just as... so
【单选题】In restricted visibility the speed of a vessel without operational radar may be ________ enable effective avoiding action to be taken on sighting another ship．
A.
too low to
B.
too high to
C.
too high for
D.
too low for
【单选题】The basic principle of radar is illustrated by what happens when one shouts in a e. The echoof the shouting 11 the walls helps a person determine the size of i cave. With radar, however , the waves ar...
A.
through
B.
for
C.
on
D.
against
【单选题】My radar is not working．I require shorebased radar assistance．Is shorebased radar assistance ________ ？
A.
used
B.
available
C.
in use
D.
can be used
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