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【单选题】
、顾客买下的那箱没有次品的概率为
A.
0.325
B.
0.758
C.
0.675
D.
0.766
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三
《煤矿安全规程》执行说明指出,采煤工作面作业规程必须按采区设计和采煤工作面设计的要求编制,其内容应包括:煤炭、材料运输的设备型号及其系统(包括分阶段煤仓或采区煤仓的容量);采煤工作面范围内外及其上下的采掘情况及其影响;安全技术措施(包括职业病危害防治措施);劳动组织及正规循环图表;采煤工作面主要技术经济指标表;避灾路线。还包括()。
A.
供电设施、电缆设备负荷及供电系统图
B.
采煤工作面地质、煤层赋存情况
C.
采煤方法及采煤工艺流程
D.
顶板管理方法
E.
采煤工作面的通风方式、风量、风速、通风设施、通风监测仪表的布置等通风系统图
F.
洒水、注水、灌浆、充填、压风等管路系统图
G.
安全监测监控、通信与人员位置监测、照明设施及其布置图
《煤矿安全规程》规定,采用锚杆、锚索、锚喷、锚网喷等支护形式时,()等必须在施工组织设计或者作业规程中明确。
A.
锚杆(索)的形式、规格、安设角度
B.
混凝土强度等级、喷体厚度
C.
挂网规格、搭接方式
D.
围岩涌水的处理
根据《煤矿安全规程》规定,生产水平和采(盘)区必须实行分区通风。下列关于准备采区的规定中,正确的是()。
A.
必须在采区构成通风系统后,方可开掘其他巷道
B.
采用倾斜长壁布置的,大巷必须至少超前2个区段,并构成通风系统后,方可开掘其他巷道
C.
采煤工作面必须在采(盘)区构成完整的通风后,方可回采
D.
采煤工作面必须在采(盘)区构成完整的排水系统后,方可回采
《煤矿安全规程》规定,()时,必须经矿总工程师批准。
A.
更换主要通风机压差计
B.
改变主要通风机转数
C.
改变主要通风机叶片角度
D.
改变对旋式主要通风机运转级数
根据《煤矿安全规程》规定,在下列哪些情况下必须进行主要通风机性能测试?()
A.
新安装的主要通风机投入使用前
B.
主要通风机技术改造后
C.
主要通风机更换叶片后
D.
主要通风机倒机后
根据《煤矿安全规程》规定,下列关于矿井反风演习的说法中正确的是()。
A.
更换主要通风机后,应当进行1次反风演习
B.
采区通风系统有较大变化时,应当进行1次反风演习
C.
每年应当进行1次反风演习
D.
矿井通风系统有较大变化时,应当进行1次反风演习
根据《煤矿安全规程》规定,下列关于主要通风机房的说法中正确的是()。
A.
必须安装水柱计(压力表)
B.
必须安装电流表、电压表
C.
必须安装轴承温度计
D.
必须有直通矿调度室的电话
E.
有反风操作系统图
F.
有司机岗位责任制和操作规程
G.
有操作规程
根据《煤矿安全规程》规定,高瓦斯、突出矿井的煤巷、半煤岩巷和有瓦斯涌出的岩巷掘进工作面安装和使用局部通风机,要遵守下列哪些规定?()
A.
必须采用双风机,并能自动切换
B.
主、备风机必须同等能力
C.
主风机必须三专供电
D.
备用风机电源必须取自同时带电的另一电源
E.
当主风机故障时,备用局部通风机能自动启动
F.
给主风机供电的专用变压器最多可向4个不同掘进工作面的风机供电
《煤矿安全规程》规定,其他掘进工作面和通风地点正常工作的局部通风机可不配备备用局部通风机。这里说的其他掘进工作面是指()之外的掘进工作面。
A.
高瓦斯、突出矿井的煤巷
B.
高瓦斯、突出矿井的半煤岩巷
C.
高瓦斯、突出矿井的有瓦斯涌出的岩巷
D.
无瓦斯涌出的岩巷
根据《煤矿安全规程》规定,除高瓦斯、突出矿井的煤巷、半煤岩巷和有瓦斯涌出的岩巷掘进工作面必须实行双风机双电源(主风机必须为三专电源)外,其他掘进工作面的局部通风机配置,下列说法中正确的是()。
A.
主风机采用三专供电的,可不配备备用风机
B.
实行双风机双电源时,主风机可不采用三专供电
C.
实行双风机双电源时,主、备风机必须能自动切换
D.
实行双风机双电源时,主、备风机的电源必须取自同时带电的不同母线段的相互独立的电源
E.
实行双风机双电源时,主、备风机必须同等能力
F.
主风机故障时,备用局部通风机能投入正常工作
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