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【单选题】
人力资源是体力与智力的结合，具有主观能动性，具有不断开发的潜力，表明人力资源具有（）A.
双重性
B.
能动性
C.
可持续性
D.
社会性
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B.
Measurement of the Earth's Magnetic-Field Intensity.
C.
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D.
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