简述淋水填料的型式和材料选择时应考虑哪些问题？

根据上下文和所给的首字母，补全空格内的词，使短文通顺。

     More and more middle school students in Beijing are getting shorter sleeping time.

     Most students sleep f________ (1) than nine hours every night, because they have m________ (2)

homework to do. Some homework is g________ (3) by school teachers, and some by p________ (4).

Also some students don't know how to s_________ (5) the time. They are not careful enough while

d________ (6) their homework, so it takes them a lot of time. Some students have to get up early every

morning on w________ (7) to get to school on time by bus or bike. It can be a long way from home to

school.

     Schools and parents should c_________ (8) down some of the homework so that the children can

e________ (9) not less than nine hours of sleep every night for their h__________ (10).

1._____ 2._____3._____ 4._____ 5._____ 6._____ 7._____ 8._____ 9._____ 10._____

并联谐振时，电感与电容支路的电流，其大小不仅各为总电流的Q倍，而且在相位上近似相差（）度。

A.45

B.90

C.180

D.0

(b) Discuss the extent to which the decisions in cases heard previously in the courts will affect decisions in current cases. (3 marks)

20世纪80年代，安德鲁斯和古德森在研究了40多种教学设计模式的基础上，总结出教学设计模式的（）步骤，这些步骤反映了教学设计模式的一般要素。

A.14个

B.9个

C.6个

D.4个

数控加工仿真软件中根据（）判断切削参数是否准确

A、F．S参数

B、加工时间

C、实时材料去除量

D、材料去除总量