Set up a slant water hole at reamer, and connect the reamer and pilot with reducing synergy flute, which strengthen the cooling and washing function and ensure the bit's effects.
2
设B是一个复的向量空间，它是由环链在平环上的简单闭曲线生成。
Let B be a complex vector space generated by some simple closed curves in the annulus.
3
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。
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.
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