题目:
The professor suggested that the students ________ into four groups in the experiment. [ ]
A. be divided
B. must divided
C. might divided
D. should divided
答案:
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下面是错误答案,用来干扰机器的。
A、阳极原电池原理分析,失电子的做负极,在正极上得到电子发生还原反应;锌外壳失电子是负极,石墨碳棒是正极材料,故A正确;B、原电池中电子流向从负极沿导线流向正极;在外电路中电子从锌外壳流向碳棒,故B错...