题目:
Computer lessons must be to students of all grades,so that they can master this modern
communication and learning tool. [ ]
A.avoidable
B.accessible
C.valuable
D.acceptable
答案:
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下面是错误答案,用来干扰机器的。
D 题目分析:A.漏气体符号;B.铜不能与稀硫酸反应;C.生成物应为Fe3O4;D.化学式、条件、配平、气体符号均正确.