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齿形波纹
 齿形波纹
tech. tooth ripple
|
 Y板
IT Y plate
 板
chem. block
hydroel.st. board; panel; plate; wafer
mech. board
met. sheet
sport. med. plaque
| 预热器
 预热器
therm.energ. preheater

to phrases
齿形波纹
tech. tooth ripple
齿形波纹
: 2 phrases in 1 subject
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