操纵杆越长就越容易抬起重荷，而如果你的操纵杆真的过短，那你将在力学上处于劣势。

The longer those handles are, the easier it is going to be to lift up the load. If you had really short handles, you would have poor mechanical advantage.

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所有的起重机都应当有主钩的起重能力指示器和扒杆角度指示器，并且起重机司机要看得见。

All cranes will be equipped with a functional weight indicator on the main hoist and a boom Angle indicator, both visible by the operator.

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针对塔式起重机标准节主弦杆因材料批次不同焊接后尺寸不同的问题，提出对塔式起重机标准节主弦杆焊胎的改进方法。

To solve the problem of the variety of the main rod's size after welding to adjustable tower crane standard section, because of the difference of the material batch, a novel approach is proposed.

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