物体作机械振动时，其频率与周期的乘积等于（）。 A.零 B.小数 C.1 D.分数

填入下列横线的几句话，正确的排序应该是[ ]

　　第一天到达一个小村的小旅店过夜。___________。“鸡声茅店月”—这诗的意境在我的心上留下了永不磨灭的印记。

①月色窥窗

②天将破晓时

③周围死般沉静

④醒来听到鸡鸣

⑤似乎在致黎明的问候

A、①⑤③②④

B、③②①④⑤

C、③②④①⑤

D、②④③①⑤

尖牙窝一般位于哪颗牙根尖的上方（）

A.上颌中切牙

B.上颌侧切牙

C.上颌尖牙

D.上颌前磨牙

E.上颌第一磨牙

什么是双排脚手架？

Directions.

A recruitment drive for 100,000 Olympic volunteers, which aims to help the Chinese and foreigners get involved in the 2008 Games, was officially launched in Beijing last month. You intend to apply for certain positions, and now write a letter the recruitment office, showing your motivation and stating your eligibility for the requirements.

Write your letter in no less than 100 words. Write it neatly on ANSWER SHEET 2.

Do not sign your own name at the end of the letter, use "Li Ming" instead.

Do not write the address.

买卖双方签订的买卖合同中规定，买卖双方对货物的风险不以装货港的船舷作为分界线，那么他们采取的价格条件是（）.

A.FAS

B.F0B

C.CIF

D.C&F