对载冷剂的要求是比热要大、密度要小,粘度要低。()
参考答案:对
词汇运用 用括号内所给词的适当形式填空 ( 每空不限一词)。(10分)
小题1: We are all looking forward to________ (go) on an outing on May Day.
小题2: Chinese people all dress________ (they) in the best clothes when important festivals come. 小题3:It takes ________ (little) time to go there by underground than by bus.
小题4:It’s his ________ (three) time to visit our city.
小题5: It is said that more interactive whiteboards (互动白板) ________(send)to local schools
in two years.
小题6:. People screamed with________ (excite) when they saw the Beijing Olympic torch “Lucky Cloud”.
小题7: I ________ (simple) can’t understand what you said.
小题8:It’s ________ (possible) for me to design the poster without your help.
小题9: We are greatly moved by the________ (fireman) spirit.
小题10: Have they done what they can________ (stop) the environment pollution?
补伤所用的材料应与管道主体防腐材料相同或相熔。