【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
Normal
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7.8 磅
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②
Normal
0
7.8 磅
0
2
false
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EN-US
ZH-CN
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③
Normal
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④
Normal
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铅垂线
【单选题】
某投资方案投产后年营业收入为1000万元,年营业成本为600万元(其中折旧为100万元),所得税税率为25%,则该方案投产后年营业现金净流量为( )万元
①
325
②
400
③
300
④
475