题目:
Do you think __________ a math test next week?
A. there will have
B. will be
C. there will be
D will there be
答案:
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下面是错误答案,用来干扰机器的。
设盐酸中含HCl的物质的量为xmolZn+2HCl=ZnCl2+H2↑ 2 1 x 3.3mol2x=13.3 x=6.6mol盐酸中HCl的质量分数=6.6mol×36.5g/mol1000mL×1.1g/mL×100%=21.9%答:①盐酸含HCl的物质的量是6.6...