在闷热的房间里开会，有的人容易打“哈欠”，其调节方式是（） A.神经调节 B.体液调

Many people like to travel by plane , but I don't like it because an airport(飞机场) is usually far from the city. You have to get early and wait for hours for the plane to take off and it is often late. You can’t open the windows. You can’t choose the food. Planes are fast, but they still take hours to go out the airport and into the city.

I like traveling by train. I think trains are safe. Train stations are usually in cities. When you are late for a train, you can catch another one. You can walk around in the train and open the windows. You can see many interesting things on your way. I know it takes a little more time.

I also like cars. You can start your journey when you want to, and you don’t need to get to train station or bus stop. Also you can carry many things with you in a car. But sometimes there are too many cars on the road.

小题1: Why do many people like to travel by plane?

A．Because it’s fast.

B．Because it’s safe

C．Because you can walk around in the plane.

D．Because it’s cheap.小题2: Which is NOT the good thing about the train?

A．It is safe.

B．It takes a little more time.

C．You can open the windows.

D．You can walk around in the train.小题3: If you want to take a lot of things with you, what do you take to go out?

A．A bus.

B．A car.

C．A train.

D．A bike小题4: What is the bad thing about the car?

A．You needn’t go to a station.

B．You can start your journey when you want to.

C．There are too many cars on the road.

D．You needn’t go to a bus stop.小题5: What does the writer think of the transportations?

A．He thinks it takes a lot of time to go to and get out of the airport to take the plane.

B．He likes to take a train because it takes a little more time.

C．He likes to take a car because he has a car.

D．He likes to take a plane because it’s fast.

金属烤瓷桥上釉完成后采用的焊接是

A．焊料焊接
B．炉内焊接
C．激光焊接
D．电阻钎焊
E．铸造支架焊接

（1）把汤匙放在手指尖上，调节支撑汤匙的支点，可使其在手指尖上水平静止，如图1所示，请在图中画出此时汤匙所受重力的示意图．

（2）如图2所示，物块在水平面上处于静止状态，画出它所受重力和支持力的示意图．

（3）建筑工地上随处可见各式各样的起重机，图3为一种常见的“桅杆式起重机”，其中起重臂部分可以看成杠杆，0点为支点．请在图中画出F₁、F₂的力臂L₁、L₂．

开标不一定必须在招标文件确定的提交投标文件截止时间的同一时间进行，但必须在投标文件截止时间之后进行。（）