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搜题
【单选题】
关于国家建立计量基准的原则，以下哪个表述是不正确的( )。A.
要根据社会、经济发展和科学技术进步的需要
B.
由国家质检总局负责统一规划，组织建立
C.
属于基础性的计量基准，建立在国家质检总局设置或授权的计量技术机构
D.
属于通用性的计量基准，可建立在有关部门所属的计量技术机构
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皮皮学刷刷变学霸
举一反三
【单选题】A vessel is carrying three lights in a vertical line. The highest and lowest of these are red and the middle light is white. Which statement is always TRUE?
A.
During the day，she would display three balls in a vertical line
B.
If making way，she would show masthead lights at night
C.
If at anchor，she need not show anchor lights while displaying identifying lights
D.
Her fog signal would consist of a rapid ringing of a bell for five seconds every minute