圆柱螺旋线的形状和大小是由()三要素决定的。
A.圆柱直径、导程、旋向
B.圆锥直径、导程、旋向
C.圆柱直径、圆柱长度、导程
D.圆柱直径、圆柱长度、旋向
参考答案:A
已知一次函数y=-2x-3,经过点(0,______)与点(______,0),y随x的增大而______.
His parents ask him _______ on the road because it's dangerous. [ ]
A. to play
B. not to play
C. to not play
D. playing