求翻译：本课题过分析各类恒张力吊车的特性和应用场合，了解各类船用吊车的优缺点并熟悉船用吊车的恒张力控制系统。是什么意思？

The subject had to analyze the features and applications of various types of constant tension cable car, to understand the advantages and disadvantages of various types of marine crane and be familiar with the marine crane constant tension control system.

This topic leads the characteristic and the application situation of analyze each kind of 恒 tension hoist, understanding the merit and shortcoming that each kind of ship uses the hoist and acquaint with the 恒 tension control system that the ship uses the hoist.

This topic has analyzed each kind of permanent tensity crane the characteristic and the application situation, understood each kind of ship uses the crane with the crane good and bad points and the familiar ship the permanent tensity control system.

This issue analysis of characteristics and applications of the constant-tension cable car, understand the advantages and disadvantages of marine crane and familiarity with constant tension control system of marine crane.

正在翻译，请等待...