液压泵的排量是指在不考虑泄漏的情况下，泵轴每转一周所排出油液的体积，其大小取决于几何尺寸（），故齿轮泵属于（）量泵

A. 齿轮泵
B. 单作用叶片泵
C. 轴向柱塞泵
D. 径向柱塞泵

A. 定量
B. 变量

A. On foot.
B. 2 hours.
C. It's warm.
D. 5 days a week.

A. There are two bus stops.
B. You can get there by bus.
C. You can take Bus No. 6.
D. It is very far from here.