In my opinion, the idea of a family is much narrower than ________.

A．that used to be

B．it used to

C．it was used to

D．it used to be

在ABS常规制动阶段（）。

A.ABS并不介入制动压力调节

B.调压电磁阀总成中各进液电磁阀均不通电而处于开启状态，各出液电磁阀均不通电而处于关闭状态，电动泵也不通电运转

C.制动主缸至各制动轮缸的制动管路均处于沟通状态，而各制动轮缸至储液器的制动管路均处于封闭状态

D.各制动轮缸的制动压力将随制动主缸的输出压力而变化