吊车、消防车、钻探车等从事专门作业的车辆使用10年。

For cranes, fire engines, drilling vehicle and other vehicles engaged in special operations, the standard usage life is 10 years.

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学生在收音机或电视上收听了专门的授课节目之后，也必须把指定的作业寄出，通过函授批改订正。

After special lectures on radio or television, these students, too, have to send set work for correction by correspondence.

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旋转吊具是专门为桥式起重机、浮式起重机、以及门座式起重机而配套设计的。适用于ISO标准20英尺、40英尺和45英尺集装箱装卸作业。

Rotating spreader is specially designed for bridge cranes, floating cranes, and gantry cranes. It is applicable to ISO standard 20 feet, 40feet, 45feet container.

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