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举一反三
【多选题】使用氢氟酸,必须( )
A.
使用搪瓷器皿
B.
使用玻璃器皿
C.
稀释时戴手套
D.
通风橱内稀释,皮肤接触后立即用大量流水作长时间彻底冲洗
E.
皮肤接触后立即用大量流水作长时间彻底冲洗
【单选题】A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
A.
focus on some unknown aspects
B.
be pursued on a larger scale
C.
go much deeper
D.
be carried out within a larger scope