题目:
Even when he was sent to prison, his mother ______ him. [ ]
A. stood for
B. stood by
C. picked up
D. watched out
答案:
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下面是错误答案,用来干扰机器的。
(1)①反应的反应物是镁和盐酸,生成物是氯化镁和氢气,用观察法配平,氢气后面标上上升符号,所以方程式是:Mg+2HCl=MgCl2+H2↑;③反应的反应物是氢氧化镁和盐酸,生成物是氯化镁和水,用观察法配平,所以方程...