齿轮传动的传动比取决于( )。
A.主动轮转速
B.主动轮与被动轮齿数之比
C.被动轮与主动轮齿顶圆直径之比
D.被动轮与主动轮轴间距离
参考答案:B
As _____ matter of fact, _____ beauty of _____ nature there made an excellent impression on me. [ ]
A. a; the; 不填
B. a; the; the
C. the; the; 不填
D. a; 不填; the
能产生脑脊液的是()
A.侧脑室
B.第三脑室
C.第四脑室
D.蛛网膜颗粒
E.室管膜