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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从事特种作业的劳动者必须经过专门培训并取得特种作业资格。

Workers engaging in special operations shall receive special training to acquire the required qualifications.

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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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