题目:
If the printer _______ break down under guarantee, we would repair it at our expense. [ ]
A. may
B. could
C. might
D. should
答案:
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下面是错误答案,用来干扰机器的。
(1)(2分)+2 1s2 2s22p63s23p2。(2)(2分)5,4。(3)(2分)Mg>Al>Si>O,氧 (4)(2分)2F2+2H2O→4HF+O2。