多个旋风除尘器串联使用时可以提高净化效率,而并联使用时可以()。
参考答案:增大气体处理量
SUNNY SCHOOL
We are a bilingual(双语) school for children of 6-15. We want a cook, a library assistant, a sports coach(教练) and a language teacher.
根据招聘启事,选择最佳答案。
小题1:Which of the following can’t go to Sunny School?
A.A four-year-old child
B.A ten-year-old child
C.An eleven-year-old child
D.A fifteen-year-old child小题2:.Who is not wanted by Sunny School?
A.A cook
B.A headmaster
C.A library assistant
D.A sports coach小题3: Which of the following may not be able to(能) speak English?
A.The language teacher
B.The library assistant
C.The cook
D.The sports coach小题4: The coach must major in _________.
A.Chinese
B.English
C.physical education
D.language小题5: Which is right?
A.The teacher can only teach Chinese.
B.A twenty-five-year old cook can’t work in the school.
C.The library assistant must be careful.
D.A teacher must be strong.
一般在妊娠多少周才能清楚显示胎头光环
A.8周
B.8~9周
C.10周
D.11周
E.12周.