生产水泥需要加入石膏以调节水泥的凝结速度，石膏的用量必须严格

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生产水泥需要加入石膏以调节水泥的凝结速度，石膏的用量必须严格控制，否则过量的石膏会造成水泥的（）现象。

A.安定性不良

B.凝结速度加快

C.凝结速度减慢

D.强度降低

答案

参考答案：A

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There are two sets of Games-the Winter and the Summer Olympics, and 1__________ are held every

four years on a regular basis. The Winter Olympics are usually held two year 2________ the Summer

Games. Only athletes 3______________ have reached the agreed standard for their event

4(admit)________________ as competitors. They may come from 5___________ in the world.

There are no running races 6___________ horse riding events. 7______________ there are

competitions like skiing and ice skating 8______________ need snow and ice. That's 9_________

they're called the Winter Olympics. It's in the Summer Olympics 10____________you have the running

races, together with swimming, sailing and all the team sports.