前言：为了保证一种既有斜齿轮又有直齿轮零件在注塑成形后能顺利脱模，给出了一套一模两位，点浇口进料，旋转脱模，胶套式二次分型的双分型面注射模的设计。
To make sure that a plastic part with helical gear and spur gear can be demoulded successfully, an injection mould is designed with double parting faces, point gate feeding and rotating demould.
介绍光纤传感器的基本知识。对光纤点式液位报警器的结构、原理和性能进行了介绍。为油品高低液位报警介绍了一种新技术。
The paper introduces the basic knowledge of optical fiber sensor, describes its structure, principle, and performance. It is a new technology for alarming liquid level.
SDI12投入式液位变送器主要用于水文站水位观测点不便建井或建井费用昂贵的地区。
YLN-SMT-HART/SDI12 is mainly used for the inputting type water level transmitter hydrological observation wells or inconvenience built costly.
第二章刻画了一类满足三项递归关系的实零点多项式序列的零点位置和零点重数的关系。
In the second chapter, we characterize the relations between locations and multiplicities of zeros of a sequence of real-rooted polynomials defined by a three-term recurrence relation.
第二章刻画了一类满足三项递归关系的实零点多项式序列的零点位置和零点重数的关系。
In the second chapter, we characterize the relations between locations and multiplicities of zeros of a sequence of real-rooted polynomials defined by a three-term recurrence relation.
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