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【多选题】
自动空气断路器也称为空气开关或自动开关，是常用低压保护电器，可实现（）保护。A.
短路
B.
过载
C.
失压
D.
过压
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举一反三
【单选题】She told me that she has already gone to the United States four times before she attended that conference.
A.
had already been
B.
has already been
C.
already went
D.
was already going
【简答题】在对流温度差大小相同的条件下，在夏季和冬季，屋顶天花板内表面的对流放热系数是否相同？为什么？
【简答题】在对流温度差大小相同的条件下，在夏季和冬季，屋顶天花板内表面的对流换热系数是否相同?为什么?
【单选题】She is already 16years old、But she____as if she were still a little girl.
A.
believes
B.
absorbs
C.
accrses
D.
behaves
【简答题】A．No, because she's already spent most of it. B．No, because she has already lent it to a friend. C．Yes, because she got some while she was shopping. D．Yes, because she wants to help him.
【单选题】---Does Miss Ye like playing __________tennis? ---No, she doesn’t, but she likes playing ________ piano.
A.
the; the
B.
/; the
C.
the; /
D.
a; a
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