Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? ()
A safe-water buoy will display red and white vertical stripes of reflective material
B. All reflective material is white because it is the most visible at night
C. A special-purpose mark will display either red or green reflective material to agree with its shape
D. A preferred-channel buoy displays either red or green reflective material to agree with the top band of color
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过滤式自救器只适用于空气中一氧化碳浓度不大于()%,氧气浓度不低于18%的条件下。
A. 2
B. 1.5
C. 2.5
华夏银行采取买断式销售方式销售贵金属产品,买入1000枚,单价100元(不含税)。当季卖出300枚,单价120元(不含税)。季末,贵金属产品公允价值为90元/枚。已知销售贵金属产品适用的增值税税率为17%。则记入“贵金属买卖差价收入”科目的金额是()。
A. 3000元
B. 6000元
C. 7000元
D. 20000元
一个路由表,有3条,分别从rip,ospf,eigrp学过来的,到达相同目的,问路由选择哪条走?