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国际标准化组织简称: ,本标准每 5 年修订一次。
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【单选题】The human body feels comfortable when the humidity is about( )
A.
40%-60%
B.
40%-60%
C.
30%-60%
【简答题】Almost everyone considers going on a diet sometime in his or her life. All, regardless of and age, have something in common- -losing weight and losing it fast. Though their common aim may seem bas...
【单选题】The human body feels comfortable when the humidity is about( )
A.
40%-60%
B.
40%-80%
C.
30%-60%
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【单选题】The human body feels comfortable when the humidity is about( )
A.
40%-60%
B.
40%-60%
C.
30%-60%
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