()是通过把聚化物分解成小分子量的碎片来降低液体粘度的。
A.杀菌剂
B.降滤失剂
C.破胶剂
D.稳定剂
参考答案:C
The happy student was singing ____ he was going home.[ ]
A. until
B. as
C. since
D. and
注水泵在试运前,要制定临时()的预防和处理方法。
A、注水站
B、出现故障
C、试运
D、措施