An toànCâu 456 / 521
The safe practice when climbing a portable ladder is to:
a.Maintain three points of contact and face the ladder while climbing
b.Carry tools in both hands so you can work faster at the top
c.Climb up the back side of the ladder
d.Stand on the very top cap for extra reach
Giải thích
Maintaining three points of contact (two hands and one foot, or two feet and one hand) while facing the ladder keeps you stable if you slip. Carrying tools in both hands, climbing the back, or standing on the top cap all remove stability and are common causes of ladder falls.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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