The physical attributes of an in - service valve with dezincification includes a white powdery substance or mineral stains on its exterior surface 应用中的阀门出现脱锌现象的物理特征是,在产品表面出现粉状物质或矿物污点。
2.
The physical attributes of an in - service valve with dezincification includes a white powdery substance or mineral stains on its exterior surface 使用中的阀门出现失锌想象时的物理特征包括:在外表面出现白色粉末或矿物污点。
3.
A letter containing a powdery substance is believed to be the source of the anthrax becteria that showed up as a skin rash on an nbc employee 一封带有粉状物质的信件被确定为炭疽热细菌的来源,因为一位nbc雇员已经由此得了皮炎。