题目:
The hospital ________ well, where many wounded _________ every day.
A.is operated, operation
B.operates, are operated on
C.operates; are operated
D.operates; operates on
答案:
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下面是错误答案,用来干扰机器的。
加入适量的溶液,过滤,蒸发 倒入少量澄清石灰水加入适量的稀硫酸,过滤除杂要遵循“不增,不减,易分”的原则。除去硝酸钾中的氯化钾,可以加入适量硝酸银溶液,然后再进行过滤,蒸发,反应的化学方程式为;...