问题 问答题 简答题

掘进工作中的粉尘危害及综合防尘措施有那些?

答案

参考答案:

掘进岩石巷道时,钻眼、爆破、装岩、运输作业,不可避免地要产生大量的岩石粉尘。根据测定,这些粉尘中一般有游离的二氧化硅30%一70%,这些粉尘极易在空气中浮游,被人吸人体内,时间久了就易患矽肺病,严重地影响工人的身体健康。综合防尘的具体措施有:

(1)、湿式钻眼。这是综合防尘最主要的技术措施。钻眼过程中用水冲洗炮眼,使岩粉变成浆液从炮眼里流出来。这样,在钻眼期间粉尘不会飞扬,能显著地降低巷道中的粉尘浓度。

(2)、喷雾、洒水。这对防尘和降尘都有良好的效果。

(3)、加强通风排尘工作。

(4)、加强个人防护工作。

通过上述措施,可以将工作面空气中的粉尘浓度降低,但仍无法彻底根除,还需进行个人防护,如在工作顶作业一定要佩戴防尘口罩。

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(B)

Make sure you don’t miss Australia’s largest and most exciting kite-flying festival this year, which promises to be a great day out for the whole family. The skies will come alive with hundreds of kites of all shapes and sizes from local and international kite makers and fliers.

It’s not just the experts who can fly their kites — come down and fly your own. If you don’t have a kite, you can buy one from one of the stalls in the park, or better still, make one at one of our kite-making workshops.

Then there’s the multicultural entertainment program in the Pavilion Courtyard Amphitheatre of great music, dance and performance. The headline act this year is Rastawookie. Their music is a fusion (结合) of many different styles from South America, the Caribbean and western countries. There will also be free music and dance workshops, so why not try your hand at one of these? For the children there will be additional rides, face painting, jugglers (变戏法者), stilt walkers, and clowns. After all these activities, you probably can’t wait to eat. Choose from one of our fabulous multicultural food stalls offering food and drinks from all over the world or for something simpler — nothing could be better than a good old-fashioned sausage!

There’s so much to do and so much to see, so if you’re up for a great day, then the only place to be on Sunday, September 9th is down at Bondi Beach for Sydney’s most exciting, fun and family-friendly festival.

60. According to the passage, which of the following statements is TRUE?

A. The kite-flying festival is the largest festival in the world.

B. The majority of visitors are people out of Australia.

C. The kite-flying festival only reflects(反映)the culture of Australia.

D. Not only professional kite makers and fliers attend this festival.

61. What is the most important part of the entertainment program during the festival this year?

A. Tricks for children.             B. Various styles of dance.

C. Rastawokie’s music.            D. Shows preformed by visitors.

62. During the festival, the author recommends all the following places to go EXCEPT _______.

A. music and dance workshops      B. parks for children

C. kite-making workshops          D. food stalls

63. According to the passage, the kite-flying festival is suitable for ______.

A. the whole family who want to spend a day out

B. lovers who want to have a quiet day of their own

C. the elderly who want to take a walk       

D. travelers who like adventure