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标准化死亡比(standard mortality ratio)
标准化死亡比(standard mortality ratio)
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标准化死亡比(standard mortality ratio)
A.电流互感器变比标准化
B.电压互感器的影响
C.差动继电器动作电流偏小
D.保护定值偏高
What was another contribution by Edison to the movies?
A.He introduced the 35 mm standard machine to the world.
B.He introduced the 35 mm as the international standard film width.
C.He created a 35 mm standard device for showing movies.
D.He created his own standard devices for showing 35 mm film.
A.假设甲乙两厂的工人数相同
B.假设甲乙两厂患某职业病的工人数相同
C.假设甲乙两厂某工种工人的工龄构成比相同
D.假设甲乙两厂的工人数构成相同