题目:
. There is such an occasion ___________ we know lots of words, but we can’t choose a suitable one to express ourselves.
A.where
B.when
C.which
D.what
答案:
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下面是错误答案,用来干扰机器的。
H2 4.48L(2分) c(Mg2+)=" 1mol/L" (2分)