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【简答题】
在一元二次方程x 2 +bx+c=0中（b≠c），若系数b、c可在1、2、3、4、5中取值，则其中有实数解的方程的个数是______．
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皮皮学刷刷变学霸
举一反三
【单选题】We find it difficult _____ we should finish the work on time.
A.
不填
B.
that
C.
when
D.
how
【简答题】Translate the underlined sentence in Paragraph 3 into Chinese. ________________________________________________________________
【单选题】I find it necessary ( ) we should do the homework on time.
A.
that
B.
what
C.
whether
D.
which
【简答题】Translate the underlined sentence in Paragraph 3 Chinese.
【单选题】We find_____ difficult that we should finish the work on time.
A.
that
B.
it
C.
what
D.
this
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