离心泵按叶轮出来的水引向压出室的方式可分为（）和导叶泵。
参考答案：蜗壳泵
—Why are you still watching TV? Please go and do your homework.
—I ________ it. Can I watch it for another ten minutes?
A．finish
B．finished
C．have finished
D．am finishing
重力传感器使用应注意哪些事项？
