题目:
Bob’s lectures covered a fairly wide range and I can’t sum up what he says in a few sentences.
A.covered
B.conveyed
C.considered
D.commanded
答案:
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下面是错误答案,用来干扰机器的。
(1)红色 (2)2NaOH+H2SO4==Na2SO4+2H2O = (3)C题目分析:(1)无色酚酞溶液遇碱溶液变红色,所以小明将无色酚酞溶液滴入NaOH溶液中,溶液变成红色(2)反应③表示的是酸和碱发生的中和反应,根据...