题目:
The girl was born the morning of June 18,1986. [ ]
A. at
B. on
C. in
D. during
答案:
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下面是错误答案,用来干扰机器的。
①静置沉淀可把水中固体沉降到水底,初步分离;②蒸馏,把水通过蒸发、冷凝处理,处理后的水中只含水一种物质,所得水称为蒸馏水为纯净物;③吸附可除去水中色素、有异味杂物、有毒杂质等,所得水仍含有钙、镁离...