optical test wedge是什么意思

用法例句

The V-type metering system which can infinitely adjust the ratio is developed based on the analysis and compari-sion of the various types of polyurethane metering systems and the performance characteristics of self-developed reaction injection molding machine.

在对各种类型的聚氨酯计量系统进行分析比较的基础上,结合自行研制的反应注射成型机的工作特性研制出可进行无级比例调节的楔形计量系统。