直流参考电压（UnmA）及在0.75UnmA泄漏电流测量中，泄漏电流测试线应使用屏蔽

初产妇胎头入盆多发生在临产前（）

A.3～4周

B.2～3周

C.临产时

D.1周

E.1～2周

国家标准中。A4图纸的幅面尺寸为210X297，A3的图纸的幅面尺寸为295X420.

Cars are an important part of life in the United States. Without a car most people feel that they are poor. And even if a person is poor , he doesn’t feel really poor when he has a car.

Henry Ford was the man who first started making cars in large numbers. He probably didn’t know how much the car was going to change American culture. The car made the United States a nation on wheels. And it helped make the United States what it is today.

There are three main reasons why the car became so popular in the United States. First of all, the country is a big one and Americans like to move around it. The car makes the travel the most comfortable and cheapest. With a car people can go to any place without spending a lot of money.

The second reason cars are popular is the fact that the United States never really developed a practical and cheap public travel system. Long distance trains have never been as common in the United States as they are in other parts of the world. Now there is a good system of air-service provided by planes. But it is too expensive to be used often.

The third reason is the most important one, though. The American spirit of independence is what really made cars popular. Americans don’t like waiting for a bus, or a train or even a plane. They don’t like to have to follow an exact timetable. A car gives them the freedom to plan their own time. And this is the freedom that Americans want most to have.

Less oil has caused a big problem for Americans. But the answer will not be a bigger system of public transportation. The real answer will have to be a new kind of car, one that does not use so much oil.

小题1:We can learn from this passage that Americans ______.

A．spend a lot of money traveling by car

B．travel a lot in their cars

C．seldom travel by plane

D．use public traffic often小题2:Which of the following statements is TRUE?

A．In the United States even the poor own cars.

B．In the United States all the poor have no cars.

C．When an American has a car, he will never be poor.

D．An American will feel poor unless he has a car.小题3:In the writer’s opinion, cars are popular in the United States mainly because ___.

A．Americans like to plan their own time

B．The United States does not have enough public transportation

C．Americans will not feel poor when they travel in their cars

D．Americans cannot move around without their own cars小题4:“A nation on wheels” in the second paragraph means that _______.

A．everyone in the United States owns a car

B．the United States produces most of the cars in the world

C．cars play an important part in American’ life

D．the United States depend on car industry for its development

在物业管理招标的类型中，将物业管理招标分为住宅项目招标和非住宅项目招标的依据是（）。

A.物业管理项目的服务内容

B.物业类型

C.物业管理招标主体

D.物业管理服务方式

危险化学品包装主要是用来盛装危险化学品并保证其（）的容器。

A.安全运输

B.防止泄漏

C.减少碰撞