（）是晶体A、象牙 B、二碘甲烷 C、琥珀 D、猫眼石

People like to say “Thank you” when others help them or say something kind for them. It is a very good habit.

You should say “Thank you” when someone walking ahead of you keeps the door open for you, when someone says you have done your work well, or you have bought a nice thing, or your city is beautiful. We can use “Thank you” not only between friends, but also between parents and children, brothers and sisters.

“Excuse me” is another short sentence we often use. When you hear someone say so behind you, you know that somebody wants to walk pass you without touching you.  When others are talking, if you want to speak to one of them, say “Excuse me” first, and then begin talking. You should also do so when you begin to cough or make any noise before others.

Let’s learn to say “Thank you” and “Excuse me”.

小题1:You should say “Thank you” when__________.

A．you say something kind to others

B．you help others

C．someone helps you

D．you are in trouble小题2:When you are going to ask someone to tell you the way, you should say “_______”.

A．Thank you

B．That’s very kind of you

C．Excuse me

D．The same to you小题3:The passage mainly tells us the way____________.

A．to be happy

B．to be polite

C．to help others

D．to be healthy

OSN3500/2500/1500支持（）和（）。

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若1美元＝8元人民币；传真机使用说明书进口关税税率7.5%，进口环节增值税税率17%；传真机传感器属自动许可管理商品。
根据上述情况，回答以下问题：

关于传真机使用说明书进口关税与进口环节增值税的征收情况，下列表述正确的是( )。

A．进口关税免征；进口环节增值税免征

B．进口关税免征；进口环节增值税68元

C．进口关税30元；进口环节增值税68元

D．进口关税30元；进口环节增值税73.1元

下面哪几项属于EVDO0的关键技术（）。

A.前向虚拟切换

B.固定编码与调制

C.HybriD.ARQ

D.反向信道增强

加工误差？什么是疲劳极限？