第二管被设计成用于输送氧气的拉伐尔喷嘴形状并且它包围着用于输送固体物质或粉尘的第一中心管。
A second tube is configured as a Laval nozzle for the delivery of oxygen and encloses a first central tube for the delivery of solid substances or dust.
围绕这一中心观点，本文从三方面分为四章进行研究：第一方面是对传统过错理论的概述。
Around this central point, this article is divided into four chapters three studies: the first is the traditional fault theoretical overview.
围绕这一中心观点，本文从三方面分为四章进行研究：第一方面是对传统过错理论的概述。
Around this central point, this article is divided into four chapters three studies: the first is the traditional fault theoretical overview.
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