【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/1B4246EB20A700FB9BF424D97ABD6F60.jpg title=20.jpg alt=20.jpg/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/10F240833FEB8919AA9599A2B03124AF.jpg title=20-1.jpg alt=20-1.jpg/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/276FAC9B6D837E3CBD0AF856D9C63C0E.jpg title=20-2.jpg alt=20-2.jpg/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/D9BE7162C1C7A1B5FF542513C1E20374.jpg title=20-3.jpg alt=20-3.jpg/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/62B22F63194A9CE437326E2421DCF156.jpg title=20-4.jpg alt=20-4.jpg/>
【单选题】
某企业赊销货物的信用条件是：20日内付款，给予2%的现金折扣，30日内全部付清。这一信用条件可简略表示为（ ）
①
"n/30,2/20"
②
"2/20,n/30"
③
"20/2,n/30"
④
"20/2,30/n"
【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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