泥浆护壁通常采用塑性指数大于30的高塑性黏土。
参考答案:错
解析:泥浆护壁通常采用塑性指数大于25、粒径小于0.005mm的黏土颗粒含量大于50%的黏土(即高塑性黏土)或膨润土。
---What happened to you yesterday?
---At the bus stop a thief _____ my handbag and ran off down the street.
A.caught
B.stolen
C.robbed
D.snatched
吸器