由通信卫星转发给地球站的信号常被称为上行信号。

阅读短文，判断正(T)误(F)。

     A well-dressed (穿着好的) man goes into a restaurant (餐厅). He sits down at a table near the

window.

     A waiter (服务员) comes up to him and  says, " Can  I  help  you, sir?" The man says, " Can I

see the menu?" "Certainly." The man wants a good meal. He orders a lot of dishes. The waiter gets

them for him. The man is having his meal. At this time, a boy comes in and sits down beside the man.

He asks the man to give him an ice cream. The man does so. Now the boy is eating his ice cream.

The man is saying, "I’ll go out for a newspaper (报纸)." Then he goes out.  After the boy eats his

ice cream up( p~光) ,he stands up and goes away.  But the waiter stops him and asks, "Where is

your father?  He didn't pay for the meal! "

    "Father? You're wrong. He isn't my father. I don't know him. I meet him in the street. He says he

will give me an ice cream if (如果) I come here at twelve o'clock. "

( )1 The man and the boy are father and son.

( )2 The man goes out of the restaurant to buy a newspaper.

( )3 The boy eats a lot in the restaurant.

( )4 The boy's father isn't here.

( )5 The man doesn't know the boy.

合同管理的重点是( )。

A．合同的订立过程

B．监督合同的履行

C．工程变更与索赔管

D．违约处理

（6分）为了预防环境污染并对尾气进行综合利用，某硫酸厂用氨水吸收尾气中的SO₂。再向吸收液中加入浓硫酸，以制取高浓度的SO₂及（NH₄）₂SO₄和NH₄HSO₄固体。

为测定上述（NH₄）₂SO₄和NH₄HSO₄固体混合物的组成，现称取该样品4份，分别加入相同浓度的NaOH溶液各40.00 mL，加热至120 ℃左右，使氨气全部逸出〔（NH₄）₂SO₄和NH₄HSO₄固体分解的温度均高于200 ℃〕，测得有关实验数据如下：（标准状况下）

实验序号	样品的质量/g	NaOH溶液的体积/mL	氨气的体积/L
Ⅰ	7.4	40.00	1.68
Ⅱ	14.8	40.00	3.36
Ⅲ	22.2	40.00	1.12
Ⅳ	37.0	40.00	0.00

（1）实验过程中有关反应的离子方程式为_________________________________________。

（2）由Ⅰ组数据直接推测：标准状况下3.7 g样品进行同样实验时，生成氨气的体积为__________L。

（3）试计算该混合物中（NH₄）₂SO₄和NH₄HSO₄的物质的量之比为__________________。

（4）欲计算该NaOH溶液的物质的量浓度应该选择__________组数据，由此求得NaOH溶液的物质的量浓度为____________________________________________________________。

调查事故的主要目的是（）

A.追究责任

B.计算损失

C.防止重演

D.吸取教训

万用表测量得到的交流电压是最大值。（）