Twin adjust rotation screw on both covers and pistons, to avoid continuous heavy stresses by teeth, shaft, body.
调整旋转双螺杆都涵盖和活塞队，以避免连续沉重压力的牙齿，竖井机构。
As the pump rotor continuous rotation, the above cycle of suction and exhaust process and the achievement of the purpose of the pump continuous extraction.
随着泵转子的连续旋转，以上吸气和排气过程循环进行，实现了泵的连续抽气目的。
The nitrogen contents and nitrogen forms were studied in albic soil with longterm crop rotation and soybean, maize, wheat continuous cropping.
对轮作及大豆、玉米、小麦长期连作白浆土中氮含量及有机态氮组分变化进行研究。
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