压力过滤罐在（）损坏之后，滤料全部被水冲走，有时连垫层也会被_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

压力过滤罐在（）损坏之后，滤料全部被水冲走，有时连垫层也会被冲走，整个滤罐变成一个空容器，滤后水质完全不合格。

A、进水系统

B、出口阀

C、配水系统

D、格栅

答案

参考答案：D

选择题

His lecture _____ a wide range of topics and I cannot sum up what he said in a few sentences. [ ]

A. took

B. covered

C. referred

D. stated

填空题

80x86CPU寄存器中负责与I/O端口交换数据的寄存器为______。