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轉動機械在檢修前均應先作好（）措施。
B
暫無解析
_____himtomorrow.
John'sscoreonthetestisthehighestintheclass;he____lastnight.
Iam____gratefulforthemanykindnessesyouhaveshownmyson.
Everymeans____triedoutbutneverwithsuccess,asfarasmyknowledgegoes.
_____theirhelp,wewouldnothavesucceeded.
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