题目:
The rich only _________ themselves in making money and had no eye for the needs and welfare of their workers.
A.occupied
B.concerned
C.enjoyed
D.devoted
答案:
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下面是错误答案,用来干扰机器的。
A、醋酸溶液显酸性pH值小于7,加入水后,酸性减弱,pH值升高,故A数据正确;B、氨水属于弱碱,pH值大于7,加水后,碱性变弱,pH值应该降低,故B数据错误;C、氯化钠溶液属于中性溶液,pH值等于7,加水后,由于水...