单词non-perforated
Operating Principle: The diaphragm valve is a handwheel-operated valve, utilizing a two-piece stem separated by non perforated diaphragms.
运转原理：膜板阀是一种手轮型阀门，它采用两个由非穿孔横膈膜隔开的阀杆。
PLASTICS. THIN SHEETS. DETERMINATION OF TEAR RESISTANCE (NON PERFORATED TEST PIECE).
塑料.薄膜.抗撕断强度的测定（非多孔试验件）
Pressure Loss Research of Perforated and Non- perforated Muffler
穿孔和非穿孔消声器压力损失研究