【判断题】齿轮传动的传动比是两轮转速之比,也是两轮齿数之比。
【判断题】齿轮传动的传动比是主动齿轮转速与从动齿轮转速之比,也等于两齿轮齿数之比
【判断题】齿轮传动的传动比是主动齿轮转速与从动齿轮转速之反比,也等于两齿轮齿数之比。
【单选题】Concerning the heart the right description is
A.
Two thirds of the heart lie in the right side of anterior median line
B.
Inferior vena cava drain to left atrium
C.
Pulmonary valve looks like semilunar
D.
Right ventricle gives rise to pulmonary trunk
E.
Pulmonary vein drain into right atrium
【单选题】患者李某,阑尾炎术后第3天,被安置于普通病房,病室的温度和湿度应保持在: