基坑(槽)支护结构的主要作用是( )。
A.美观
B.支撑土壁
C.围护
D.隔水
参考答案:B
. Marry notices are placed in the park warning people to ____ the grass.
A.keep out
B.keep out of
C.keep away
D.keep off
有哪些情形的,不得担任保险公司高级管理人员?