钢丝绳索具在使用前必须先试吊，再正式起吊。先择吊点应与吊重重心在同一条铅垂线上。
Bdfor using the sling, it should have a test. The shoice for the lifting point should be on the same line with the center of gravity.
第一次进行吊重物时，需要先进行试吊，即先缓慢的将重物吊起，升到一定高度确定没问题以后，在继续提升到所需要的高度。
Continue to rise to the height of 3, the first lifting weights, need to try hanging, namely first slow will lift a weight, to rise to a certain height to determine no problem.
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