双螺杆泵的螺杆之间依靠（）传动。
A、带
B、蜗杆
C、联轴节
D、齿轮
参考答案：D
——Mr. King ___________ by the reporter yesterday.
——He’s great! He helped so many disabled people.
A. was interviewed
B. is interviewed
C. is interviewing
肾盂的形态多数为
A．壶腹形B．圆形C．枝形D．喇叭状E．卵圆形
