题目内容
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[判断题]
CCTV是英文Closed Circuit Television的缩写,意思是闭路电视监控系统。()
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第7题
A.opened and closed
B.to be opened and closed
C.being opened and closed
D.having been opened and closed
第11题
Calculate the solubility at 25℃ of CaCO3in a closed vessel containing a solution of pH 8.60.