一台压缩机的同轴箱装有加热器,这台压缩机不可能使用的工质是()。
A.R22
B.R134a
C.R717
D.R502
参考答案:C
Dear Mary,
I must go to see your grandparents now.I prepare(准备) these things for you.Your dictionary is in the bookcase.Your schoolbag is on the sofa.Your pencil box,notebooks and your school card are in the schoolbag.Your jacket is on the chair.Don’t forget your watch.It’s on the desk.
Love you.
Mom
小题1:What’s not in the schoolbag?
A.The notebooks
B.The school card
C.The pencil box
D.The pen小题2:Who writes(写) the note(便条)?
A.Mary
B.Mary’s father
C.Mary’s mother
D.Mary’s friend小题3:Where is Mary’s jacket?
A.On the chair
B.In the bookcase
C.On the sofa
D.On the desk小题4:What does the word “forget” mean(意思是)?
A.拿走 B忘记 C.带来 D.看
发生电气火灾后必须进行带电灭火时,应该使用()。
A、消防水喷射
B、二氧化碳灭火器
C、泡沫灭火器