目的了解胎膜早破难产发生率升高的原因。
Objective Understand reason of high occurrence rate of dystocia while caul early broken.
提出破舱临界渗透率的概念，明确船舶破舱后进水量速度的变化规律。
Moreover, a concept of critical permeability for ship breakage is put forward.
结果：发现羊水镜诊断率高达90%，同时可了解胎先露及胎膜早破情况。
Results: It showed that the diagnostic rate could reach more than 90%.
破壳率各处理组差异不显著（P＞0.05）；
No significant difference of broken egg rate was found in everygroups(P>0.05).
破壳率各处理组差异不显著（P＞0.05）；
No significant difference of broken egg rate was found in everygroups(P>0.05).
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