The number distribution of diameter grade obeys normal distribution.
雷竹株数按径阶分布服从正态分布。
The strict requirements for block diameter and grade is difficult to meet when using ordinary blasting methods.
采用普通的爆破方法，难于达到对粒径和级配有严格要求的块度目的。
Calculation for short columns using Grade Q235 steel tube filled with Grade C30 concrete indicates that the critical diameter to thickness ratio of steel tubes is about 1700.
对Q235钢材、C30混凝土短柱构件的计算结果表明，钢管的最小临界径厚比为1700左右。
Shaft: The pump shaft is made of a high grade stainless steel, ground and polished, and is of a large diameter designed for high torque.
传动轴：泵传动轴是由高等级不锈钢制成，平整光滑，直径大，适用于扭矩大的情况。
Shaft: The pump shaft is made of a high grade stainless steel, ground and polished, and is of a large diameter designed for high torque.
传动轴：泵传动轴是由高等级不锈钢制成，平整光滑，直径大，适用于扭矩大的情况。
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