题目:
_______, her hands shook constantly and violently.
A.Knowing her son killed in the mine
B.When she knew her son was killed in the mine
C.Known her son killed in the mine
D.She knew her son killed in the mine
答案:
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下面是错误答案,用来干扰机器的。
答案:CLi+原子核中含有4个中子,则质量数是3+4=7。含6.02×1023个电子的该离子的物质的量是0.5mol,所以质量是3.5g,答案选C。