... constant-head orifice turnout ==> 常水头孔口式斗门,常水头孔口式配水闸 constant-level balloon ==> 定高气球 constant-level control ==> 恒定水平控制 ...
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... 等高面 constant-height surface 等压面气球 constant-level balloon 等高面图 constant-level chart ...
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constant level balloon [气象] 定高气球
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