便携式梯子种类有（）。 ["直梯","人字梯","延伸梯","滑梯","栈桥梯"]
正常结算性挂账由（）审批并登记《运营主管工作日志》后交柜员办理。 ["一级主管","二级主管","二级以上主管","运营主管"]
金属烟尘中容易造成“金属热”职业病的烟尘粒径是（）μm。 ["0.0l～0.02","0.05～0.5","0.6～0.9","1.1～1.3"]
宾利车型continental的中文名称是（） ["慕尚","飞驰","欧陆","致悦"]
电焊烟尘的成分中占数量最大的是（）元素。 ["铁","硅","锰","钙"]
母兔空怀期
