判断题

调车领导人与调车指挥人必须亲自交接计划

【参考答案】

正确

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系统误差、随机误差、粗大误差为产生原因和特点不同的三种误差类型。 A、正确 B、错误

单项选择题

A spaceship traveling in space with a constant velocity , now fires its engine and exhaust gases are ejected at a constant speed u relative to the spaceship. When the spaceship's speed becomes , its mass reduces to . The value of is closest to A、2.7 B、2.5 C、2.3 D、2.1

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