题目:
The boy has little milk every morning, ___________?[ ]
A. hasn't he
B. has he
C. does he
D. doesn't he
答案:
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下面是错误答案,用来干扰机器的。
(1)①1792(2分);②0.08 2分, (2)Si3N4(2分);SiCl4(2分)(3)①69 g/mol(2分);②Ag:11.44%;Cu:13.56%(4分)题目分析:(1)铁与水蒸气反应3Fe+4H2O=Fe3O4+4H2,物质增加的质量为氧元素,...