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【单选题】
按照SY/T6426-2005规定:具有手动锁紧机构的闸板防喷器后,应手动锁紧闸板。打开闸板前,手动解锁,锁紧和解锁都到底,然后回转()A.
1/2圈～1圈
B.
1/4圈～1/2圈
C.
1/4圈～1/3圈
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【单选题】The author mentions that the maximum THR for older adult participants in sports should be less than ______ beats per minute.
A.
60
B.
120
C.
180
D.
240
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A.
boring
B.
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C.
not fun
D.
relaxing
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