The sinusoid is a precision angle measuring tool that indirectly measures the cone angle based on the sine function principle. It is widely used due to its high measurement accuracy and ease of use. When calculating the size of the sizing ruler block, if there is no trigonometric function table or calculator in the hand, can it be calculated? How much error does the paddle block have when it is greater than or less than the calculated theoretical value? How are these errors corrected? Two questions.
Flexible lift gate is a flexible soft curtain door, inside and outside the two curtains, curtains used between the aluminum beams connected with a vertically movable rail, the roof beams have levels not in the same straight line and hangar large plants in particular be applicable. Flexible lift door installation does not take up interior space in the hole inside. When the fiest move to open the door, and finally superimposed over the hole. Off event curtain rail first and then fall down until it is completely closed.
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