问题 多项选择题

帷幕灌浆施工过程中,下列不得改变浆液浓度的是()。

A.当某一比级浆液的注入量已达300L以上,而灌浆压力和注入率均无改变

B.当某一比级浆液的注入时间已达1h,而灌浆压力和注入率均无改变

C.灌浆压力保持不变,注入率持续减少

D.注入率大于30L/min

E.灌浆注入率保持不变而压力持续升高

答案

参考答案:C, E

阅读理解

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Africa is a very diverse land with many different tribes. One tradition that many of these groups share is painting or marking their bodies and faces in color. They do this for many reasons. Some marks are used to identify people as part of a group.____ 1____ Let’s look at some different examples of body painting.

____2_______ Among the Masai of East Africa, when men are old enough to marry and make decisions for their people, they participate in a special ceremony in which they paint their heads and faces red. This ceremony take place every seven to fourteen years, so there is not an exact age for participating in it. The Samburu, also from East Africa, like to paint their faces and hair red because they think it looks attractive.

______3________ To show that he has killed a lion, a man will paint his body with a natural white material, making special marks to represent this accomplishment. The Masai men also use this white to show that they are on longer boys and are considered adults.

One quite unusual example of face painting is done by the Wodaabe people of West Africa. Once a year, they have a beauty contest for men. ___4_________ Then they add white and black circles and lines. Black paint is used near the eyes and on the lips to draw attention to the whiteness of their eyes and teeth, which the Wodaabe consider most beautiful.____ 5_________.

As you travel, enjoy the beautiful and bright colors of Africa.

A.Red is the common color in body painting because it often represents health and long life.

B.Other marks are used for ceremonies such as weddings and during times of war.

C.The ceremony expresses hope for rain.

D.The Masai men also have a unique way of showing that they are brave.E. The women then decide which man they like best.

F. The men pretend to fight each other.

G. The men paint their faces yellow and red.

单项选择题