网点服务人员服务态度不好或服务效率低下而导致客户投诉（）次以上，经确定为有效投诉的，责令其下岗接受培训。
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How should you signal the crane operator to hoist（）.
A. With forearm vertical and forefinger pointing up，move hand in small horizontal circles
B. With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
C. Extend arm with fingers closed and thumb pointing upward
D. Place both fists in front of body with the thumbs pointing upward
安全带的挂钩或绳子可以挂在移动或不牢固的物件上。
A. 正确
B. 错误
螺旋拉紧装置一般安装在皮带几何长度小于（）米，功率较小的皮带输送机上。
A. 100
B. 80
C. 90
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