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某施工单位承揽了一项排水厂站的总承包工程，在施工过程中发生了如下事件。 事件一：施工单位与某材料供应商所签订的材料供应合同中未明确材料的供应时间。急需材料时，施工单位要求材料供应商马上将所需材料运抵施工现场，遭到材料供应商的拒绝。两天后才将材料运到施工现场。 事件二：某设备供应商由于进行设备调试，超过合同约定的期限交付施工单位订购的设备，恰好此时该设备的价格下降，施工单位按下降后的价格支付给设备供应商，设备供应商要以原价执行，双方产生争执。 事件三：施工单位与某施工机械租赁公司签订的租赁合同约定的期限已到，施工单位将租赁的机械交还租赁公司并交付租赁费，此时，双方签订的合同终止。 事件四：该施工单位与某分包单位所签订的合同中，明确规定要降低分包工程的质量，从而减少分包单位的合同价款，为施工单位创造更高的利润。 问题 事件四中的合同当事人签订的合同是否有效
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[案例二] 背景 某高速公路第五施工合同段地处城郊，主要工程为路基填筑施工。其中K48+010～K48+328段原为路基土方填筑，因当地经济发展和交通规划需要，经各方协商，决定将该段路基填筑变更为(5×20+3×36+5×20)m预应力钢筋混凝土箱梁桥，箱梁混凝土强度等级为C40。变更批复后，承包人组织施工，上部结构采用满堂式钢管支架现浇施工，泵送混凝土。支架施工时，对预拱度设置考虑了以下因素：(1)卸架后上部构造本身及活载一半所产生的竖向挠度。(2)支架在荷载作用下的弹性压缩挠度。(3)支架在荷载作用下的非弹性压缩挠度。(4)由混凝土收缩及温度变化而引起的挠度。根据设计要求，承包人对支架采取了预压处理，然后立模、普通钢筋制作、箱梁混凝土浇筑、采用气割进行预应力筋下料；箱梁采用洒水覆盖养生；箱梁混凝土强度达到规定要求后，进行孔道清理、预应力张拉压浆，当灰浆从预应力孔道另一端流出后立即终止。箱梁现浇施工正值夏季高温，为避免箱梁出现构造裂缝，保证箱梁质量，施工单位提出了以下三条措施：(1)选用优质的水泥和集料。(2)合理设计混凝土配合比，水灰比不宜过大。(3)严格控制混凝土搅拌时间和振捣时间。 问题： 除背景资料中提到的三条构造裂缝防治措施外，再列举两条防治措施。
The ability to laugh at your own flaws, weaknesses and blunders has long been recognized as a sign of maturity. (67) Eleanor Roosevelt put it, "You don’t grow up (68) you have your first good laugh at yourself." And yet this is one of the most difficult aspects of your (69) of humor to develop. It’s easy to see the humor in someone else’s (70) or flaws, but it’s another story when the (71) thing happens to us. That’s why we’ve put (72) working on this part, of your sense of humor until you’ve already (73) some good humor skills in areas that have (74) to do with laughing at yourself. Oscar Wilde once offered a valuable (75) about the way we live our lives when he said that" Life is (76) important to be taken seriously." (77) do you think he meant by this I don’t think he meant you don’t have to (78) your responsibilities, promises, work, etc. seriously. He didn’t mean that it’s OK to live life with no (79) . I think he meant that the quality of our life (80) when we approach everything in a (81) manner. We lose the aliveness, joy and (82) we had when we were kids when we take everything so seriously, (83) when we take ourselves so seriously. I think the key here is to take your work and your responsibility seriously, (84) take yourself lightly in the (85) When you take yourself seriously all the time, you will (86) many benefits that a playful attitude and humor can offer.
可加速毒物的排泄的药物是
可用于急性锐痛的药物
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