The impeller comprises a blade and a hub, wherein the blade is connected with the hub of the impeller through a level shaft in a shape of a bended arch.

所述叶轮包括 叶片和轮毂，所述叶片与叶轮轮毂通过一弯拱形水平轴相连。

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Lower the viscometer until the grooves on the spindle shaft just touches the coating, and recheck the level.

降低粘度计直至凹槽在定子的轴正好接触到涂料上，并重新检查其水平。

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Based on a method of a assistance photosource, a basic method of coal level detection on the mine shaft coal bin is put foruard.

基于一种辅助光源照射方法，提出对井下煤仓煤位进行检测的基本方法。

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Rehabilitation work on the Silver Shaft began in the first quarter of this year and is now completed to around the 5, 700-foot level, which is around 400 feet from the shaft bottom, the company said.

FORBES: Update:Hecla Plans To Reopen Lucky Friday Mine In 1Q; Loss Reported In 3Q