成人腹部摄片使用滤线器的理由是()A．腹部厚度大 B．腹部组织密度高 C．腹部脏器多

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    Do you always agree with your teachers? Sometimes you have a different answer t 1 a math problem.

Or perhaps they scold (训斥) you when you don't think you did anything w 2 .

    What do you do then? A story said t 3 more and more students are speaking out and even quarrelling

w 4 their teachers.

    It's good for students to say what they think. In the past, f 5 Chinese students dared speak back to

their teachers. It was a rule that w 6 the teachers said is always right. But now students are beginning to

think more b 7 themselves and dare to say what they want.

     But students should choose the right way to speak out. We should respect(尊敬) teachers. They are

older t 8 you and have more experience. So, never u 9 rude words when you don't agree with them.

     Try to find the right time to talk to your teacher. For e 10 , discuss the problem after class.

1._____2._______3. _______4.________ 5.________ 

6.  ____ 7._______8. _______ 9. ______ 10.________

凹模圆角半径的大小对弯曲变型力，（），弯曲件质量等均有影响。

破伤风的特异性治疗，可用（）

A.溶血素

B.细菌素

C.类毒素

D.抗毒素

E.破伤风菌苗

拉杆托架组成焊缝开裂时（）

A.补焊

B.重焊

C.点焊

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