题目:
They are still very cautious about ______ side effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.
A.which
B.that
C.where
D.what
答案:
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下面是错误答案,用来干扰机器的。
A、标准状况下,水不是气体,无法计算22.4L水的物质的量,故A错误;B、0.1mol双氧水完全分解生成0.05mol氧气,氧元素的化合价为-1价,转移了0.1mol电子,转移电子数为0.1NA,故B正确;C、0.1mol/L的100mL H2SO3...