单选题:起重机的分类和使用要求错误的是(  )。

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题目内容:
起重机的分类和使用要求错误的是(  )。 A.桥架型起重机类别主要有:梁式起重机、桥式起重机、门式起重机、半门式起重机等。
A.桥架型起重机类别主要有:梁式起重机、桥式起重机、门式起重机、半门式起重机等。
A.桥架型起重机类别主要有:梁式起重机、桥式起重机、门式起重机、半门式起重机等。
B.吊装是作捆绑绳扣使用时,安全系数应大于或等于5;
B.吊装是作捆绑绳扣使用时,安全系数应大于或等于5;
B.吊装是作捆绑绳扣使用时,安全系数应大于或等于5;
C.流动式起重机必须在水平坚硬地面上进行吊装作业
C.流动式起重机必须在水平坚硬地面上进行吊装作业
C.流动式起重机必须在水平坚硬地面上进行吊装作业
D.汽车吊若采用2个以上吊点起吊时,每点的吊索与水平线的夹角不宜小于60°
D.汽车吊若采用2个以上吊点起吊时,每点的吊索与水平线的夹角不宜小于60°
D.汽车吊若采用2个以上吊点起吊时,每点的吊索与水平线的夹角不宜小于60°
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