在代理买卖中，证券经营机构应遵守三大原则：一是代理原则；二是效率原则；三是公开、公平

膨胀生产线的工作原理：在浸渍器内利用液态二氧化碳对烟丝进行浸渍，然后通过（）、振动柜、干冰皮带秤将含有一定量二氧化碳的烟丝送入膨胀系统的膨胀塔中；使烟丝内的二氧化碳快速变为气体，与此同时，烟丝中的水分也被汽化，促进烟丝组织结构膨胀。

March Break Leadership Camp

The aim of this FREE program is to develop an awareness of race relations, diversity, an equal issue for students in Grades 6-8.

Place: The Central Library Room

Time: March 16&17, 2009 from 9:00 am to 3:00 pm

Pick up and hand in registration forms(报名表) at the Central Library. All forms must be handed in by March 6^th. Space is limited.

Please send any questions related to the program to Becky George, the Public Library 905-831-6265 ext 6230 or email: pickering-younity@hotmail.com

Free Your Space……Free Your Mind

At the Central Library: Wednesday, May 13^th from7:00 pm to 8:30 pm

This time management course will help you to create more balance and time in your life. In today’s increasingly stressful times, it is becoming more difficult to spend quality time with family and friends. This course will provide positive solutions and strategies (策略) to achieve peace.

Book Club for Teens

At the Central Library: Every 2^nd Thursday at 7:00 pm

Do you enjoy reading? Part of the pleasure of reading comes from meeting with others to discuss characters, plots or style. Come to trade ideas and questions, and make new friends.

This program is currently full but for more information, please call 905-831-6265 ext 6232.

Computer Training

Group computer classes for teens will be provided at the Central Library in March, April, and May. Registration starts at 9:30 am on Friday, March 6^th for the March session; Friday, March 27^th for the April session; and Friday, April 24^th for the May session.

A valid(有效的) Public Library card is required for all computer training sessions. Call the Central Library for more information or to register, 905-831-6265 ext 6243.

Limit 10 participants(参加者) per class.

小题1: What do these four programs have in common?

A．They are held in the same place.

B．They are held at the same month.

C．All of them are free of charge.

D．All of them limit the number of participants.小题2:John is always in a hurry and not good at arranging his time. He should attend_________.

A．Computer Training

B．Free Your Space …..Free Your Mind

C．March Break Leadership Camp

D．Book Club for teens小题3: If you want to do computer studies, you need to ______.

A．register for each session a month in advance

B．find other students to form a group

C．go to the library to register by yourself

D．own a valid Public Library card

佝偻病轻度“O”型腿标准是两足跟靠拢，膝关节间距小于（）

A．2cm

B．3cm

C．3～6cm

D．3～4cm

E．6cm

小于1000立方米的储气罐与明火、散发火花地点的防火间距为（）m。

A.20

B.30

C.10

酮塔蒸汽用的是（）

A、1.1Mpa

B、0.4Mpa

C、2.1Mpa

D、0.1Mpa