First proof: The earliest proof used for checking by proof readers. 初稿:给校对员校对的最先稿样。
On Some Disputing Points of Pressure Vessels in Pressure Proof Tests The Design and Study of Bearing Pressure Capability and Gas Tightness Checking System 压力容器耐压试验中几个有争议的问题述评耐压及气密性试验系统的研制