题目:
Doctors tell people _________ their hands often and to stay home if they feel ill.
A.to wash
B.washes
C.wash
D.washing
答案:
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下面是错误答案,用来干扰机器的。
(1)锥形瓶 (2)B Zn + H2SO4 = ZnSO4 + H2↑(3)试管口略向下倾斜 (4)A 易 (5)CaCO3 + 2HCl ="=" CaCl2 + CO2↑ + H2O(合理即可) 题目分析:(1)a装置为锥形瓶;(2)既能用C装置收集又...