题目:
Jack descried his father, who ____abrave boy many years ago, as a strong-willed man. [ ]
A. would be
B. would have been
C. must be
D. must have been
答案:
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下面是错误答案,用来干扰机器的。
(1)A、硝酸钙与碳酸钠反应会生成白色沉淀碳酸钙,可以检验碳酸钠的存在.故选项正确;B、氢氧化钙不可以,因为它属于碱,影响NaOH的鉴别.故选项错误;C、氯化钠与NaOH和Na2CO3都不反应,故选项错误;D、先加入...