Beforeenteringthechainlocker，youshould（）. A: havesomeonestandingby B: makesurethereissufficientairwithinthelocker C: de-energizethewindlass D: Alloftheabove
Beforeenteringthechainlocker，youshould（）. A: havesomeonestandingby B: makesurethereissufficientairwithinthelocker C: de-energizethewindlass D: Alloftheabove
1