What did her parents do in response to her decision?
A. They supported her decision by every means.
B. They managed to talk her out of the decision.
C. They shouted at her angrily.
D. They forbade her to date the boy.
查看答案
Why does the speaker feel blessed?
A. Her parents live near her.
B. She communicates well with her parents.
C. She has never quarreled with her parents.
D. Her parents are still alive.
原油的相对密度是指原油的密度与某一温度和压力下纯水的密度之比。我国习惯指1atm、（）时原油密度与1atm、（）纯水的密度之比。
A. 30℃ 5℃
B. 20℃ 5℃
C. 20℃ 4℃
D. 30℃ 4℃
一般而言，原油中轻组分含量高，则凝点低；重组分含量高，则凝点高。
A. 对
B. 错
凝点高于（）度的原油成为高凝油。
A. 30
B. 40
C. 50
D. 60
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