How safety, develop efficiently the petroleum resources is a hard nut to crack to put in the petroleum industry in front.
如何安全、高效地开发石油资源是摆在石油工业面前的一道难题。
Each spindle shall be fitted with a load bearing nut and an unload safety nut or other constantly active safety device. The safety nut shall be loaded if the load bearing nut fails.
每个转轴都应配备一个轴承螺母和一个卸载安全螺母或其他的活动安全装置。如果轴承螺母不能正常工作就要安装安全螺母。
It is supposed to introduce the technology of gear-rack driven mechanism and nut-screw safety mechanism from Germany.
目前，三峡升船机引入德国技术，拟采用齿轮—齿条爬升机构、长螺母柱—短螺杆安全机构。
It is supposed to introduce the technology of gear-rack driven mechanism and nut-screw safety mechanism from Germany.
目前，三峡升船机引入德国技术，拟采用齿轮—齿条爬升机构、长螺母柱—短螺杆安全机构。
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