1 roller method: there are two kinds of roller and single drum.

滚筒法：有双滚筒和单滚筒两面种。

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Single drum type of low thermal efficiency and low production capacity.

单滚筒式的热效率低生产能力小。

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The traction characteristics of fully hydraulic single drum compactor are related to its engine, hydraulic system and mechanical system.

全液压单轮振动压路机的牵引特性与其发动机、液压系统及机械系统有关系。

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Girls Aloud singer Nicola Roberts released her debut solo single Beat Of My Drum last week, shortly after it premiered on Scott Mills' Radio 1 show.

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