在我国，监理工程师是( )职务。A．行政 B．领导 C．技术 D．岗位

阅读理解。

     "Visitors to the 2010 World Expo in Shanghai will be able to go sightseeing in super cool cars with no

drivers," Shanghai city government speaker said recently.

     When the six-seat car was shown to the public, it interested many people."The car will help visitors feel

what high technology (技术) is and help them enjoy the tour of the World Expo site," said a teacher from

Tongji University. The car, 4.5 meters long, 1.7 meters wide (宽), and 1.6 meters tall, runs along a white line.

The car costs around 300,000 yuan to build and can reach a top speed of 50 kilometers per hour.

     According to the researchers, visitors will be able to driver the car anywhere in the World Expo site by

pressing a button (按按钮). If they want to get off or stop the car, all they need to do is just to press the

button again.

     "People can rent one of these cars for a whole day or just take a ride in it from one place to another," the

teacher said. About 400 to 500 of these cars will be made for the Expo in 2010. the cars will have radar (雷达)

to help them get around. They will mainly use solar (太阳能) batteries. And they have no need of drivers and

oil (汽油), these cars will help save energy and human work, and cause no pollution to the environment.

1. The new type of car has _______ seats.

A. seven

B. six

C. five

2. According to this passage, which of the following is TRUE?

A. The car can reach a top speed of 50 km.

B. The car costs about 30,000 yuan to build.

C. The car is 4.5 meters long and 1.7 meters tall.

3. Which of the following is not mentioned in this passage?

A. People can buy this type of car and drive it in the World Expo site.

B. This type of car can save energy and human work, and cause no pollution.

C. People can press the button themselves when they want to get off or stop the car.

4. The title (标题) of the passage is probably "_______".

A. Radar First Used in Cars

B. Cool Cars with No Driver

C. Tour the 2010 World Expo

EO/EG装置用得最多的是弹簧式安全阀，关于其特点说法错误的是（）。

A、结构紧凑

B、安装位置不受严格限制

C、灵敏度高

D、对振动的敏感性好

已知∠AOB=60°，过O的射线OC使∠AOC：∠AOB=3：2，则∠BOC=______．

如图所示电路中，欲使R获得最大功率，则R的阻值应为（）。

A、2Ω

B、1Ω

C、0.5Ω

D、4Ω