下颌第一磨牙最大的牙尖是（）。 A.近中颊尖 B.远中颊尖 C.远中尖 D.近中舌尖

Welcome to the Friendship Club of our school! You will meet many teenagers here and make friends with each other. We have some advice for you.

First, be friendly and polite to everybody in the club. This will make people feel comfortable when they talk to you. The impolite people are not welcome here and we will ask them to leave.

Second, be honest. We hope that our members can trust (信任)each other. If we find that you tell lies to other club members, we will ask you to leave the club.

Third, be a good listener and keep your friends’ secrets. This will make your friends trust you and it will also help you know more about your friends. If you tell your friends’ secrets to someone else, you will hurt their feelings.

At last, be generous and helpful to your friends. Sharing thoughts, ideas and opinions will help you know more about each other.

Please remember our advice when you come to the club. We meet every Friday afternoon and we hope to see you there!

根据短文内容, 判断句子正（T）误（F）。（5分 ）

小题1: If you are friendly to everybody in the Friendship Club, you will be welcomed.

小题2:If you don’t keep your friends’ secrets, you’ll be asked to leave the club.

小题3:If you want know more about your friends, you should be a good listener.

小题4: Sharing our friends’ thoughts and opinions will be bad for our ideas.

小题5:The writer has four pieces of advice for the people who would like to join the club.

四冲程柴油机完成一个工作循环，其凸轮轴的转速与曲轴转速之比为（）。

A.2：1

B.1：1

C.1：2

D.1：1/2

DSLAM用户电缆要求是什么？

在我国驰名商标由（）负责认定。

A.国家知识产权局

B.地方工商行政管理机关

C.国家工商行政管理局商标局

D.民间组织

在仪表校验中，通常要做上、下行程校验，其目的是校验该表的（）。

A.绝对误差

B.变差

C.相对误差

D.精度