单项选择题
A.立式金属罐 B.卧式金属罐 C.罐车 D.球罐
A.1,5,10,15,20 B.10,50,60,80,100,200 C.5,10,15,20,30,50 D.20,30,40,50,60
A.2 B.3 C.5 D.7
A.0.05%~0.1% B.0.1%~0.2% C.0.2%~0.5% D.1.0%~2.0%
微信扫一扫,加关注免费搜题