为了避免齿轮产生根切现象,如何确定标准齿轮的齿数?
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齿数、模数分别对应相同的一对渐开线直齿圆柱齿轮传动和一对斜齿圆柱齿轮传动,后者的_____比前者要大。
A. 齿顶高
B. 齿顶间隙
C. 重合度
Which of the following is not the most common cause of upper gastrointestinal bleeding
A. Peptic ulcer
B. Gastric telangiectasia
C. Acute erosive-hemorrhagic gastritis
D. Rupture of esophageal or gastric varices
What are the causes of intra-hepatic jaundice?
已知电路复导纳Y=(0.3-j0.4)S,则该电路一定呈()
A. 感性
B. 容性
C. 阻性