为维护行政命令的一致性，凡下行公文都要与有关单位联合发文。 ( )

根据材料内容判断句子正误，正确的在题前括号内填T，错误的填F。

     Nowadays Xiao Shenyang is a well-known comedian in China. His real name is Shen He. He was born

on May 7th, 1981. And he is from Tieling, Liaoning Province.

     In 2006, he became one of Zhao Benshan's students. After that, he played Wang Tianlai in the TV play

Xiangcun Aiqing II and Xiao Fengtian in Guandong Daxiansheng. This year Xiao Shenyang also played in

Zhang Yimou's thriller comedy San Qiang Pai An Jing Qi with Sun Honglei.

     During 2009 CCTV Spring Festival Gala, because of his wonderful performance, Xiao Shenyang won

top prize for the most popular language program, along with Mao Mao and his teacher Zhao Benshan. From

then on, a new star was born. He became famous all over China as a comedian.

     In fact, Xiao Shenyang studies hard and does well in many things. He began to learn acting at the age of

fourteen. He can also imitate (模仿) many famous singers-Andy Lau, Zhang Yusheng, Dao Lang and so on.

     Be with Xiao Shenyang, you can be very happy!

( )1. He became famous all over China in 2006.

(     )2. Xiao Shenyang played Zhao Benshan's student in theTV play Xiangcun Aiqing II.

(     )3. Mao Mao and Zhao Benshan also won top prize in 2009.

( )4. Zhang Yimou also played in the thriller comedy San Qiang Pai An Jing Qi with Sun Honglei.

(     )5. Xiao Shenyang is twenty-nine years old this year.

下面对我国期货合约交割结算价描述正确的是（）。

A.有的交易所是以合约交割配对日的结算价为交割结算价

B.有的交易所以该期货合约最后交易日的结算价为交割结算价

C.有的交易所以交割月份第一个交易日到最后交易日所有结算价的加权平均价为交割结算价

D.交割商品计价以交割结算价为基础

简述现代生物技术在人类生产生活中的作用

直接人工工时耗用量差异是指单位（）耗用量脱离单位标准人工工时耗用量所产生的差异。

A、实际人工工时

B、定额人工工时

C、预算人工工时

D、正常人工工时

“床层上部紧，下部松”现象、原因及处理办法？