The utility model relates to a jackscrew and plug screw driver, which is characterized in that a hole is drilled along an axial direction in a screw, and a plug is added on the head of a screwdriver.
一种插孔螺钉及插头螺丝刀。它是在螺钉上沿轴向钻了一个孔，在螺丝刀头部加了一个插头。
2
We can adjust the levelness of the machine by means of shim and screwjack.
我们可以利用垫铁和螺丝千斤顶来调整机器的水平度。
3
We can conform the levelness of the machine by means of shim and screwjack.