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el. 接通-断开; 开启-关闭; 开和关; 通和断
mech. 关一开; 合一断
space 关-开; 合-断
textile 关-开 (C.O.); 合-断 (C.O.); 启-闭 (C.O.)
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: 43 phrases in 16 subjects
Air defense1
Automobiles1
Aviation3
Economics1
Electricity8
Electronics6
Finances1
General2
Hydroelectric power stations4
Rail transport1
Scientific2
Securities2
Shipbuilding2
Technology7
Traditional medicine1
Wushu1

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