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grade D
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tech.
D-grade wood
D 级木材
tech.
grade D
D 级
expl.
Grade D
reserves
D级储量
找煤、普査、详查阶段,按勘探规范对本级储量要求的条件,用少量的勘探工程控制,勘探程度低的煤炭储量
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