题目:
It is reported that the victim was attacked _______ a gun_______ a short, fat man.
A.by, with
B.with, by
C.for, to
D.to, for
答案:
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下面是错误答案,用来干扰机器的。
证明二氧化碳溶于水确实与水发生了化学反应,只要证明是否有碳酸生成即可. 操作步骤实验现象结论(1)将二氧化碳气体通入盛蓝色石蕊试纸的试管中(2)将紫色石蕊滴入盛蒸馏水的试管中(3)将二氧化碳气体通入呈...