The strength of the dative bond deponds not only on the substituents R, but also on the skeletal structure of the parent ring.
研究表明配位键的强度不仅受取代基R的影响，而且还与环结构的变化有关。
Our result is Theorem 1 Let R be a ring such that zero divisors commute. Then R is nonsingular if and only if R is semiprime.
我们的结果是定理1 设R 是零因子可换环，那末R是非奇异的当且仅当R 是半素的。
Set "0 hour" on the R. A. and hour graduation ring to the R. A. indicator after loosening the graduation-ring setscrew.
松开赤经兼小时刻度环的定位螺丝后把赤经兼小时刻度环“0小时”位置对准赤经指示箭头。
Let R be an abelian ring ( all idempotents of R lie in the center of R), and A be an idempotent matrix over R.
设R是一阿贝尔环（R的所有幂等元都在中心里），A是R上的一幂等阵。
For a ring R, the following statements are equivalent:(1)R is left coherent;
证明了对于一个环R，下列条件等价：（1）R是左凝聚的；
R is semihereditary ring if and only if the sum of two coflat submodules of every R module is coflat module;
是右半遗传环当且仅当任一右R模的两个上平坦子模的和上平坦；
Notes: 1., Asfor valves in pound unit, connection unit "f" is expressed with "w" if butt weld adopted; "f" expressed with "r" if metal ring adopted.
说明：1、对磅级制阀门如采用对接焊连接，连接单元“F”用“W”表示。如采用金属环连接“F”用“R”表示。
When the key part of the R-MOG, the integrated micro-optic ring resonator was connected with the other parts of the system, there existed the back-reflection noise.
其核心敏感部件-集成微光学环形谐振腔与系统中其他元件的连接，会产生背向反射这一噪声。
R-Register office, Reception, Ring.
结婚登记处，婚礼招待会，戒指。
A ring Re, (M) iff each nonzero homomorphic image of R either contains a nonzero M-ideal or has an essential ideal.
一个环R∈（M）当且仅当R的每一个非零同态象或者包含一个非零M理想或者有本质理想。
This peper introduces the concept of direct-projective covers, and prove that a ring R is left perfect if and only if every left R-module(flat left R-module) has a direct-projective cover;
本文引入直投射覆盖的概念，证明了环R为左完全环当且仅当每一个左R-模（平坦左R-模）具有直投射覆盖；
Unfasten the R. A. clamp and turn the telescope around the polar axis to set the observing date on the date graduation ring to the observing time on the R. A. and hour graduation ring.
松开赤经制动钮并使望远镜围绕极轴旋转用以设置日期刻度盘上的观测日期对准赤经兼小时刻度盘上的观测时点。
Unfasten the R. A. clamp and turn the telescope around the polar axis to set the observing date on the date graduation ring to the observing time on the R. A. and hour graduation ring.
松开赤经制动钮并使望远镜围绕极轴旋转用以设置日期刻度盘上的观测日期对准赤经兼小时刻度盘上的观测时点。
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