【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
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②
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铅垂线
【单选题】
处于法正状态的某云杉林经营类型，最老龄级的蓄积量为12万m3，轮伐期为100年，则其法正生长量为（?????）。
①
A.1200万m3
②
B.24万m3
③
C.12万m3
④
D.120万m3