管网置换工作通常计划在什么时间进行？A.上午  B.下午  C.晚上

影响圆盘给料机下料量的因素有哪些？

通信电源中直流供电系统的浮充电压值由什么决定（）。

A、开关电源设备出厂设臵

B、由于其连接的蓄电池维护要求

C、开关电源的性能指标

D、由负荷的需要的电压决定

30岁男性，因咀嚼不适前来就诊。查见其左下后牙（）面深龋洞，自述平时无不适，但是食物嵌塞进入洞中后需剔除方可缓解酸痛症状。牙髓活力测试同正常牙，X线片显示其牙体硬组织破坏在牙本质层。诊断为牙本质龋，以下关于牙本质龋中最深层、最早出现的改变是（）

A.透明层

B.坏死崩解层

C.表层

D.细菌侵入层

E.脱矿层

某年8月23日15时45分，在L省S市某城市给水管网改造工程管沟土方施工过程中，施工现场发生沟壁土方坍塌事故，造成3名施工人员死亡，1人重伤，1人轻伤。直接经济损失40余万元。
事故发生过程：
L省S市某城市给水管网改造工程属于市政建设工程。由市自来水公司负责实施建设。
A建筑公司在得到该工程建设信息前两个多月，即6月19日以“便函”形式，委托外单位员工贺某以本单位项目部经理身份前往市自来水公司联系承揽该项工程。该项工程于6月27日开标，A建筑公司未能中标。但是由于中标单位缺少垫资资金，市自来水公司与中标单位经过协商之后，未报市招标办同意，擅自将该工程的部分工程环节改由A建筑公司承包建设，并通知贺某将此决定转告该公司。7月26日，市自来水公司与A建筑公司签订了该城市给水管网改造建设工程施工合同。8月10日，A建筑公司生产管理部刘某将该工程转包给无任何施工安全资质的贺某，双方并签订了“A建筑公司内部项目工程承包合同书”。该市的某监理公司经理薛某派没有执业资格的徐某负责该工程监理。
贺某在组织施工中发现，已开挖的管沟中心线位置略向北偏移，不符合施工要求，需要重新返工修整。8月23日，工程承包人临时雇用S市的8名流散人员承包该部分管沟清理修整工程。23日早8时，被临时招雇的8人在没有书面交底的情况下，开始清理管沟。按照工程承包人的要求，将深1.9m的管沟南侧底部向内掏挖0.6m，并在1.9m的基础上深挖0.3m，挖出的土方堆放在管沟南侧顶端。15时45分，管沟清理修整已基本完成，承担清理修整工程的8名临时工人中，有5人在管沟内休息。由于管沟南侧帮底已被掏空，加之施工段为三类土质，管沟南侧顶端堆积土较厚，造成管沟南侧24m长的侧壁坍塌，坐在管沟内休息的5人被突如其来的坍塌土方埋在管沟内，虽经多方抢救，仍有3人死亡、1人重伤、1人轻伤。

需要采取哪些整改措施

You have a goal and that is your long-term aspiration. Perhaps it’s to be happy and stand in good relation to the world around you, to be rich so you don’t have to worry about your standing, to conquer a particular area of knowledge or activity and earn recognition to ensure your standing, or simply to live an uncluttered, peaceful life, wherein you gain enough inner peace and enlightenment not to even care about your standing. Your targets are projected landmarks in time with potentially measurable results, the achieving of which you expect to draw you closer to your goal — mastering a specific yoga posture, for example, getting a particular job, reaching a certain profitability in a business, or passing an exam. Then you have your threats. These are all factors that threaten to prevent you achieving your targets — whether it’s the weather, other people’s agendas, ill-health or other possibly unforeseen contingencies. Finally, you have your remedies, the measures you take to counter or prevent the threats. These comprise both the requisite mundane countermeasures to keep your temporal plates spinning externally and, more crucially, internal adjustments to your own state of mind and energetic flow, to enable you to attain the inner balance and clarity necessary to realign your vision with your goal, when the threats, potential or actual, have temporarily obfuscated that vision. No matter how apparently complex the mundane details in need of attention, the internal readjustment process remains consistently simple. For a few moments in the midst of activity, stop whatever you’re doing, mentally relax your muscles and sinews, lengthen your spine, broaden your shoulders and pelvis, desist from holding your breath, soften your chest and breathe freely, allowing your belly to expand with the inhalation and contract with the exhalation. Let all thoughts about your situation and condition drift and be momentarily empty of self. Draw your. point of gazing out at the world back from your eyeballs into the center of your brain, between and behind your eyes, equidistant between your ears. Envisage your goal clearly and tell yourself, "I can do this!" and you will.