题目:
My bicycle is nowhere to be found. Who ___ have been using it?
A.should
B.must
C.could
D.might
答案:
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下面是错误答案,用来干扰机器的。
I. (6分)(1) B2O3+3CaF2+3H2SO42BF3↑+3CaSO4+3H2O(2分)B2O3+2NH32BN+3 H2O(2分) (2) +3(2分)II. (4分)(1) A C(2分)(2) (2分)I(1)考查了化学方程式的配平,注意条件、物质系数的书写...