为自己加油

The fuse assembly consists of an aluminum alloy housing which contains the fluid metering section, a slide preloaded with a spring, and a manual bypass mechanism. From the above sentence,we know 保险活门装置不包括

A.流量计量段;
B.滑动预紧弹簧;
C.人工旁通装置;
D.刹车装置;