停气作业时应能可靠地切断气源,并将作业管段或发备内的燃气()。
A、排尽
B、安全排放或置换合格
C、点燃
D、抽真空
参考答案:B
Mr and Mrs Green come from Australia .They are in Beijing now .Mr Green is a teacher in a high school .He teaches English ,He likes reading and running .His son, Jim, is a student.He likes playing football very much .He likes school, too. He does his homework every day . Mrs Green is a teacher ,too. She can speak a little Chinese. She likes Chinese food .She doesn’t like doing housework at all, but she likes cooking .They all like China a lot.
小题1:Mr and Mrs Green come from _______
A.Canada
B.America
C.Australia
D.English小题2:______likes running.
A.They
B. Tom
C.Mrs Green
D.Mr Green小题3:________ can speak a little Chinese.
D.Mr Green小题4:Mrs Green doesn’t like _______at all.
A.Chinese food
B.teaching
C.doing housework
D.cooking小题5:They all like ______very much.
A. China
B.Chinese people
C.playing
D. school
十大军事原则的精神实质是力求运动中歼灭敌人。