题目内容

a sac in the body where urine is held

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any of numerous substances that consist of chains of amino acids, contain the elements carbon, hydrogen, nitrogen, oxygen, and often sulfur, and are supplied by various foods

the act of discovering or the fact of being discovered

叶轮圆盘的摩擦损失,属于

A. 轴端摩擦损失
B. 流动损失
C. 容积损失
D. 机械损失

叶轮外表面较为粗糙,直接会使( )增大:

A. 流动损失
B. 机械损失
C. 容积损失
D. 叶轮损失