粮食收购资格审核机关自受理申请之日起，须在（）日内向申请者作出答复。

如图所示，A、B是两个等量异种点电荷，C、D是A、B连线的中垂线上且与连线距离相等的两点，则（　　）

A．在A、B连线的中垂线上，从C到D，各点电势都相等，场强都相同

B．在A、B连线的中垂线上，从C到D，场强先增大后减小，电势先升高后降低

C．在A、B连线的中垂线上，从C到D，场强先增大后减小，各点的电势都相等

D．在A、B连线上，从A到B，场强先减小后增大，电势逐渐升高

以下不属于商业银行进行证券投资的主要目的的是( )

A．获取资格

B．获取收益

C．分散风险

D．增强流动性

Great news! Summer Camp 2011 opens between 9:30 a.m. and 11:30 a.m. on June 30th. And it will last for a week.

All children aged 7-14 are welcome. Each child can take part in only one of the following activities and needs to pay 150 yuan for it.

　 1. Sports (basketball, football, table tennis, etc.)

　　2. Learn in groups (painting, singing, dancing, piano, computer, etc.)

　　3. English Worlds (songs, films, games, plays, etc.)

　　Some American children are coming to the camp. If you really want to spend an interesting summer holiday, please join us for learning with fun. Act now! Book your seat as soon as possible either by phone or by e-mail. Register (报名) and pay before June 18th, then you can have a Mickey T-shirt as a member of the camp.

　　Dongfang Children's Palace: No. 23, East Street, Changping

　　Tel: 83212563  E-mail: dsbc1234@childrenplace.net

小题1:The register time is before _____.

A．9:30 to 11:30 a.m.

B．June 30^th.

C．150 yuan.

D．June 18^th.小题2:Each child can only choose _____ of the activities.

A．one

B．two

C．three

D．four小题3:What cannot you do in Summer Camp 2011?

A．Learn painting and dancing.

B．Join a group that you are interested in.

C．Climb mountains and see birds.

D．Speak English with some American children.小题4:Summer Camp 2011 will offer you _____.

A．a Mickey T-shirt

B．a piano or a computer

C．some books and CDs

D．a funny camp card

低合金钢与高合金钢的区别是前者合金元素总的质量分数小于5%，后者大于5%。( )

在《喷涂聚脲防水工程技术规程》规定了喷涂作业完工后，不得直接在涂层上凿孔、打洞或重物撞击，严禁直接在（）涂层表面进行明火烘烤施工。