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混凝土等级
bridg.constr.
grade of concrete
eng.geol.
concrete class
hydroel.st.
class of concrete
混凝土
强度
等级
tech.
concrete grade
混凝土等级
标号
hydroel.st.
concrete class
混凝土 等级
:
13 phrases
in 4 subjects
Bridge construction
1
Hydroelectric power stations
5
Rail transport
1
Technology
6
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