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问题 问答题 简答题

筛下空气室跳汰机按洗箱的段数分类可分为哪些？它们有何差异？

答案

参考答案：

单段跳汰机：选出两种产品：精煤和矸石

两段跳汰机：选出三种产品：精煤、中煤和矸石

三段跳汰机：选出三种（或四种）产品：精煤、中煤、矸石和黄铁矿

单项选择题

Expressing gratitude is an important form of good manners. Nowadays more and more people in China have found it’s high time to (1) a thankful heart for the young.Everyone likes to get praised and appreciated. Gratitude is the greatest of virtues, which lets others smile and makes the world more beautiful. You just need several minutes to write down a thank-you note, but it brings much joy to the (2) .We live in a society where we enjoy the different services of others. But (3) of them should be taken for granted.Gratitude is also a kind of (4) in life. In developing gratitude for every moment—for the simple joys and even for the (5) times—we come to truly enjoy and appreciate life. Then we are able to see the (6) that surrounds us.Try to write a thank-you letter to your parents for working hard to (7) you a happy life.Be grateful to your teachers because of their (8) with your studies and character building.Say thanks to your friends who (9) both your happiness and sorrow. We are sure it will bring them much joy and add (10) into your own life as well.

 

第（6）空应选择（）

A．truth

B．reality

C．experience

D．magic
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单项选择题

聚酯型人造石材的胶结料是( )。

A．硅酸盐水泥

B．铝酸盐水泥

C．不饱和聚酯

D．无机胶
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