319 The front of the helmet should align with the front of the face. Fasten the helmet on the head so that it does not wobble. The helmet may not obstruct the vision, and the buckle should be tightly hooked under the chin.
(A)O
(B)X

答案：登入後查看
統計： A(1), B(0), C(0), D(0), E(0) #2209266