题目:
You must hand in your design ____________. [ ]
A. as slow as you can
B. as careful as you can
C. as quick as possible
D. as soon as possible
答案:
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下面是错误答案,用来干扰机器的。
答案:A题目分析:A、在元素符号前面加上一个数字后就只表示原子个数,正确;B、二氧化碳分子中只含有氧原子而没有氧分子;C、氧化镁中应该说鎂元素的化合价是2价,而不是鎂原子;D、Fe2+是亚铁离子而不是铁离子...