unchangeable water pressure method

• 稳压法

unchangeable water pressure method的用法和样例：

例句

1. Elbow flowmeter is one version of differential pressure flowmeters.
   弯管流量计是差压法流量计的一种。
2. Direct pressure and indirect pressure methods are most commonly used in first aid.
   直接压法及间接压法是急救最常用的。