喷砂过程中发现堵塞时应如何处理？

Tomorrow will be the party. I want to _____________ invitations. [ ]

A. send out

B. send in

C. send on

选词填空。    

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1．做完作业要仔细(     )。   

2．一些儿童队员正在开会，讨论参加国庆(     )的事。  

3．经过(     )，这些产品都不合格。

短文改错（10%）。

I often quarrel about my mother over whether I can watch TV after school. She hold the view that Senior

Three students have to make fully use of every minute to work hard at their lessons. It seems to me that

once I am allowed to do that, I’ll unable to control myself and forget all about my study. She also thinks

it is bad for my eye. But I really can’t accept her ideas.In my opinion, watch TV can set my mind at rest

after a day’s hard works. Besides, it is important for us to know what had happened at home and at

abroad. Thus, we shouldn’t be forbidden to watch TV.t—

如图所示a、b间接人正弦交流电，变压器右侧部分为一火灾报警系统原理图，R₂为热敏电阻，随着温度升高其电阻变小，所有电表均为理想电表，电流表A₂为值班室的显示器，  显示通过R₁的电流，电压表V₂显示加在报警器上的电压(报警器未画出)，R₃为一定值电阻。当R₂所在处出现火情时，以下说法中正确的是( )

A．V₁的示数不变，V₂的示数减小

B．V₁的示数减小，V₂的示数减小

C．A ₁的示数增大，A ₂的示数增大

D．A ₁的示数减小，A ₂的示数减小

对固定义齿固位有影响的是（）

A．基牙牙冠形态

B．基牙牙根形态

C．桥体

面形态

D．桥体龈面形态

E．固位体轴面形态