Beforeenteringthechainlocker，youshould（）.
A: havesomeonestandingby
B: makesurethereissufficientairwithinthelocker
C: de-energizethewindlass
D: Alloftheabove
A: havesomeonestandingby
B: makesurethereissufficientairwithinthelocker
C: de-energizethewindlass
D: Alloftheabove
举一反三
- Whentakingactiontoavoidcollision，youshould（）. A: Makesuretheactionistakeninenoughtime B: Notmakeanylargecoursechanges C: Notmakeanylargespeedchanges D: Alloftheabove
- Notonly__________dothework,but__________finishitontime. A: youshould;youshould B: shouldyou;shouldyou C: shouldyou;youshould D: youshould;shouldyou
- He______invaintomakehiswifehappy. A: endeavored B: madeendeavor C: triedtheendeavor D: alloftheabove
- TherearemanygoodChinesegiftsmentionedinthislecture，suchas______. A: Chineseknotandthechina B: silkandpainting C: calligraphy D: alloftheabove
- Libraries A: fieldofWriting B: spellingoftitles C: spellingofwriters"names D: alloftheabove