案例分析题背景:
某矿井采用立井开拓方式,其井底车场巷道(东半部分)布置如图所示。主、副井及井筒与巷道连接处施工已完成。副井到底后正在进行永久装备,需6个月完成。因特殊原因,主副井贯通工程尚未开始;主井提升系统临时改装已完毕。按合同约定,图示工程要在90天内完成,其中:主副井贯通(经贯通巷)20天;主井至A点(主井绕道,含两个岔点)90天;B点至F点(含等候室)20天;F点至2岔点50天;泵房、变电所及通道(含DE段)70天;C点至l岔点50天。
主井内现有地面抽出式风筒一趟,排水管、供水管、动力电缆各二路,矿井属于低瓦斯矿,车场巷道、硐室围岩稳定。
问题:
1.不考虑对头掘进。试画出车场工程满足工期要求的双代号网络计划图,并指出其关键路线。
2.确定施工高峰时同时施工的工作队个数,并说明各自的掘进线路。
3.如井筒较深,请建立主、副井到底后贯通前较合理的通风系统,并指出其优缺点。
The two claws of the mature American
lobster are decidedly different from each other. The crusher claw is short and
stout; the cutter claw is long and slender. Such bilateral asymmetry, in which
the right side of the body is, in all other respects, a mirror image of the left
side, is not unlike handedness in humans. But where the majority of humans are
right-handed, in lobsters the crusher claw appears with equal probability on
either the right side or left side of the body. Bilateral asymmetry of the claws comes about gradually. In the juvenile fourth and fifth stages of development, the paired claws are symmetrical and cutterlike. Asymmetry begins to appear in the juvenile sixth stage of development, and the paired claws further diverge toward well-defined cutter and crusher claws during succeeding stages. An intriguing aspect A. irrefutable considering the authoritative nature of Emmel’s observations B. likely in view of present evidence C. contradictory to conventional thinking on lobster-claw differentiation D. purely speculative because it is based on scattered research and experimentation [单项选择]在企业选择市场进入投资时,该市场应具有的特点是( )。
A. 新的竞争者比较容易进入 B. 企业具有竞争优势 C. 市场竞争比较激烈 D. 购买者讨价还价能力不强 [单选题]漆膜表面干燥测试可用吹棉球法或( )。
A.指触法 B.滤纸法 C.刀刮法 D.以上均可 [判断题]在兆欧表没用停止转动或被测量设备没有放电之前,切勿用手触及被测设备或兆欧表的接线柱。
A.正确 B.错误 [单项选择]移动式搅拌机应在平坦坚实的地面上支架牢靠,不准以轮胎代替支撑,使用时间一般超过( )个月,应将轮胎卸下妥善保管。
A. 1 B. 2 C. 3 D. 4 [不定项选择题]A.运输证明
A.运输证明副本 B.运输证明正本 C.运输证明复印件 D.托运或者自行运输麻醉药品和第一类精神药品的单位,应当向所在地设区的市级药品监督管理部门申请领取 [单选题]架空绝缘导线不得视为( )。
A.绝缘设备 B.导电设备 C.承力设备 D.载流设备 [单选题]在吸收操作中,保持L不变,随着气体速度的增加,塔压的变化趋势( )。
A.变大 B.变小 C.不变 D.不确定 我来回答: 提交
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