Weight per piece from 100 gm up to 260 gm,every 20 gm range as a grade.
每只重量从100克起至260克，20克为一个级差。
Now, of course we cannot yet grade the range of work that one needs for all courses.
不过，当然我们还无法批改 所有种类的作业
Excellent commutating grade treated to give wide operating range for electrical locomotive and light rail traction motors.
换向性能好，广泛应用于电力机车和轻轨牵引电机。
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