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【单选题】
在低压电器当中被称为自动空气开关的元件是()A.
FU
B.
QF
C.
QS
D.
KA
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举一反三
【单选题】Jenny and Li Ming put on ____________ boots. [ ]
A.
they
B.
their
C.
them
D.
themselves
【单选题】Originally boots were cut low, just over ________, and soft laterally, both of which limited the amount of sideways rotating force that could be applied.
A.
the feet
B.
the ankle
C.
crus
D.
knee
【简答题】水平地面上平铺 10 块相同的砖,每块砖的重量为 20 N ,厚度为 6 cm 。如将砖一块一块地叠放起来,至少要做多少功?
【单选题】Fred ______ many football boots. But this pair of boots ______ the nicest. [ ]
A.
has, are
B.
has, is
C.
there are, are
D.
there are, is
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