螺杆泵的结构及工作原理是什么？
题型：问答题 论述题
问题：
螺杆泵的结构及工作原理是什么？
题型：问答题 论述题
Every school has notice boards. Let's see what is on the notice board of an American school.
小题1: 46. From , parents can get information on the parents meeting.
A．School Policy
B．Report Card
C．After-school Program
D．Class Announcement小题2: Report Card shows parents .
A．certain school rules
B．after-school activities
C．plans for classes and tests
D．children's school life and work.小题3: Suppose Tony doesn't do well at school but makes progress, he will get on the
Report Card.
A．1
B．2
C．3
D．4小题4:Students do their homework and read books .
A．from 3:30 to 4:30
B．from 3:30 to 6:00
C．from 4:30 to 6:00
D．from 6:00 to 7:00小题5:According to School Policy visitors have to ________ when entering the school .
A．hand in a note
B．call at 524-9752
C．check in at the office
D．telephone the school