问题
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5,12,24, 36, 52, () A.58;B.62;C.68;D.72;
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24,72,216, 648, () A.1296;B.1944;C.2552;D.3240
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2,3,8,18,24,81,(),() A.48,324 B.64, 244 C.72,534 D.25,648
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02,4.12,8.6,15.24,()。A.22.72 B.27.96 C.23.96 D.26.72
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5,8,12,24,72,()A.108B.144C.324D.648
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PPD的结果观察应在A.12~24小时B.24~48小时C.48~72小时D.20分钟E.4~8周