“cement retarder”造句，怎麼用cement retarder造句

1、The paper studies on the principal technologies on coal desulfurization and retardant mechanism of cement retarder and active mechanism of cement mixed material.

2、The paper introduces the field performance of a new kind of oil well cement retarder QR-300C, and its application in production string cementing on three deep exploratory Wells at Tuha oil field.