DBMS是由______和存储管理器两大部分组成的。
参考答案：查询处理器
The Programming Counter (PC) is normally used to point out( ).
A．the address of next execution instruction
B．the address of last execution instruction
C．the address of current execution instruction
D．programmed execution instruction
当淹水沉井下沉到设计深度后，还需要做的包括（）等。
A.灌注封底止浆垫
B.井筒壁后充填
C.砌筑沉井刃脚基座
