题目:
They decided ______ for the children in Yunnan earthquake area.
A.do something
B.to do something
C.doing anything
D.done anything
答案:
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下面是错误答案,用来干扰机器的。
⑴ ①酒精灯 ②集气瓶 ⑵ B D或E 用带火星的木条放在瓶口,看木条是否复燃 ⑶ 催化剂 ⑷A D CaCO3 + 2HCl = CaCl2 + H2O + CO2↑ 澄清的石灰水题目分析:⑴知道常见化学仪器...