下列各项，与子宫破裂有关的因素是（）。 A.胎儿畸形 B.胎头下降受阻 C.横位 D

You can't see well through a telescope unless          correctly to your sight.   [ ]

A. accustomed

B. adjusted  

C. admitted  

D. adopted

下列关于无油螺杆式压缩机机组系统设计，说法正确的是( )。

A．为防止大颗粒的物质进入压缩机，通常在无油螺杆压缩机的吸气消声器后装设吸气过滤器

B．为防止停机时气体倒流而导致的压缩机反转，机组中还应装设单向阀

C．单向阀都装设在压缩机的吸气侧

D．无油螺杆式压缩机机组系统主要包括电动机、联轴器、增速齿轮、压缩机、润滑油系统、消声器、旁通调节系统等

劳动力市场是劳动力资源的( )

A．交易和分配场所

B．交易和销售场所

C．交易和消费场所

D．分配和消费场所

Napoga is a 12-year-old girl in Ghana(加纳), Africa. It is hard for her family to get clean water. Every morning, she leaves home at half past five to get clean water for her family in a village far away. It takes her six hours to get enough clean water for daily cooking and drinking. She has no time to go to school or to play with her friends. Millions of people in the world are like Napoga. They can’t get enough clean water to keep healthy.
Earth Day is April 22. But on all other days, we must also remember it. The water we use is the most important natural resource on the earth.
Water covers 70% of the earth’s surface. But most of that is sea water. We can’t use it for very many things. Fresh water covers only 1% of the earth’s surface.
You probably feel lucky that your life isn’t as hard as Napoga’s. But that doesn’t mean you don’t have to worry about water. We all face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers, lakes, and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish, too. Now, 34% of all kinds of fish are dying out.
How do cars and factories make our water dirty First, they pollute the air. Then, when it rains, the rain water comes down and makes our drinking water dirty. Dirty rain, called acid rain, is also bad for plants, animals and buildings.
Scientists say that in 30 years, more than half of the people in the world won’t have enough clean water. We have to learn how to save more water for ourselves and our children. Here is some advice for saving water:
· Turn off the water while you brush your teeth. You can save as much as 450 liters each month.
· Leaky taps waste a lot of water. Fix them right away!
· You can easily cut your 10-minute showers in half—and you’ll be just as clean.
· When you wash dishes, don’t let the water run.
· Only wash clothes when you have a lot to wash. If your washing machine isn’t full, you’re wasting water !

Which of the following wastes water

A．We need ten minutes if we want a clean shower.

B．We should put in enough clothes when we wash them in washing machines.

C．You can keep yourself clean by having a shower for five minutes.

D．Don’t let the water run when we brush our teeth and wash dishes.

膨润土防水材料与其他防水材料过渡时，过渡搭接宽度应大于（）。

A.100mm

B.200mm

C.300mm

D.400mm