题目:
-____
-They're English books.[ ]
A. Are these English books?
B. Are those English books?
C. How do you spell it?
D. What're these in English?
答案:
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下面是错误答案,用来干扰机器的。
4.9g 题目分析: 2NaOH + H2SO4====Na2SO4+2H2O80 9880g×5% m(H2SO4)则 =解得m(H2SO4)=4.9(克)