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【判断题】
在原子吸收分析中光源的作用是供给原子吸收所需的足够尖锐的共振线。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】. ____ I am concerned, we should be brave and we will reach the top of the hill at last ____ we try our best to climb the hill.
A.
So long as; as long as
B.
As far as; as longer as
C.
So long as; as far as
D.
As far as; as long as
【单选题】We wondered they reach the top of the mountain.
A.
if ; can
B.
which ; could
C.
that ; will
D.
whether ; could
【单选题】We reach the top of the mountain before it got dark yesterday.
A.
could
B.
were able to
C.
can
D.
are able to
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