常用的天然气脱水方法有哪几种?
参考答案:
有冷却分离法、固体干燥吸附法和溶剂吸收法三种。
I like _____ in the spring when the weather is warm and everything begins to grow.
A.this
B.that
C.these
D.it
临床测定地高辛血药浓度的采血时间是()
A.给药后1~2h
B.给药后2~3h
C.给药后3~5h
D.给药后4~6h
E.给药后8~24h