钢中某元素含量高时，会严重影响钢的塑性和韧性，使钢产生冷脆性，这种元素为（）。A．硅

构建知识的网络是一种重要的学习方法．

（1）请将“元素”、“原子”、“分子”填入如图适当的圆圈内，从而完成元素、原子、分子与物质之间的正确的关系图．

（2）知识应用：2007年1月30日，107国道湖北孝感段发生危险化学品硫酸二甲酯泄漏事故．中毒百余人，均出现胸闷、流泪、呼吸道水肿等情况．

①硫酸二甲酯是一种有葱头气味的油状可燃性液体，化学式是C₂H₆O₄S，它由______种元素组成，每个硫酸二甲酯分子由______个原子构成．

②硫酸二甲酯分子侵入人体的主要途径之一是通过呼吸道进入人体，从微观的角度解释其原因是______．

根据短文内容，判断下列各句正误。正确的在题前括号内写 “T”，错误的写 “F” 。

     Bob Pearson is an old man. He has two big houses and a new car. He has no wife, but he is a father of

four children. He has two sons and two daughters. One son is from England. His name is Bill. The other son

is from America. His name is Mike. One of his daughters is from China. Her name is Lanlan. The other one is

from Japan. Her name is Mikou. Bob Pearson is not the children's real (真正的) father, but he loves them

very much. The children love their "father", too. Bob Pearson has many toys for the children. He gives different

toys to different children. The boys play with toy cars. The girls play with dolls and toy animals. Bob Pearson

is the children's "father", and he is their good friend, too.

( )1. Bob Pearson has six children.                        

( )2. Bob Pearson is a nice young man.                     

( )3. Mikou is a Japanese girl.                            

( )4. Bill and Mike are from England.                      

( )5. Bob Pearson loves his children and they love him, too.

吊物件时，捆绑操作要点是什么？

下列针对逐步结转分步法核算的特点说法正确的有( )。

A．能提供各个生产步骤的半成品成本资料

B．能够全面反映各生产步骤的生产耗费水平，更好地满足各生产步骤成本管理的要求

C．逐步结转分步法在各步骤完工产品和在产品之间分配生产成本

D．逐步结转分步法根据成本在下一步骤成本计算单中的反映方式，分为综合结转和分项结转两种方法

某公安局对外来务工人员张某作出治安管理处罚决定，因无法送达张某，下列可以为张某代收法律文书的是（）。

A.张某17岁的儿子

B.张某所在单位的传达室

C.张某户籍所在地的村民委员会

D.张某80岁的父亲