本文的目的是证明关于结合环可换性的三个定理。
The object of this paper is to prove three theorems of associated ring's commutativity.
装配式成形铣刀由于其可调性和可换性等优点，在加工复杂曲面中得到广泛应用。
The assembly type formed milling cutter is widely applied in manufacturing complicated curve surface because of its advantages of adjustability and changeability.
本文给出了BCH—代数与非负BCH—代数的并代数的概念，并且讨论了拟可换性。
This paper introduced the concept of a union algebra of BCH-algeba and non-negetive BCH-algebra, and discussed quasi-commutativity of (HP) Union algebra.
对接口部分和接长杆而言，特别重要的是径向摆动精度、悬臂长度、振动性能和可换性。
The interface part and extension rod, particularly important is the radial run-out accuracy, cantilever length, vibration performance and replaceable.
本文主要对几乎可换环上酉群的基本子群的正规性进行了研究。
This thesis mainly works on the normality of elementary subgroup of Unitary group over almost commutative rings.
该攻牙机可自动进行位移、攻牙及换刀的动作，可以降低 人工操作的危险性。
The tooth shaper can automatically displace, shape teeth and exchange tools, to reduce the accident of hand-operation.
该攻牙机可自动进行位移、攻牙及换刀的动作，可以降低 人工操作的危险性。
The tooth shaper can automatically displace, shape teeth and exchange tools, to reduce the accident of hand-operation.
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