1. The rotating element of drum wheel brake is () A. Brake shoe B. Brake drum C. Friction plate D. Brake caliper?

Regarding the drum wheel brake, the following statement is correct ().

A the rotating element is a brake drum, and the fixed element is a brake shoe, a return spring and a bottom plate.

B according to the acting force of the two brake shoes on the brake drum, it can be divided into simple unbalanced type, balanced type and automatic power-assisted type.

C. Two hooves of automatic power-assisted type can be divided into "increasing hooves" and "decreasing hooves"

D when the brake is not moving, the spring works and the two brake shoes are pulled back to avoid braking.

E generally, the circumferential radius of the brake shoe is greater than the circumferential radius of the brake drum.

This topic is a multiple choice question.