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混凝土强度等级
hùnníngtǔ qiángdù děngjí
hydroel.st.
strength class
grade
of concrete
railw.
strength grades of concrete
tech.
concrete mark
;
grade of concrete
;
strength grade of concrete
混凝土强度 等级
:
4 phrases
in 2 subjects
Hydroelectric power stations
3
Technology
1
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