题目内容
一般情况下，编制招标控制价，采用的材料价格应是______。
查看答案
搜索结果不匹配？点我反馈
更多问题
Plastic is the panacea of the ages. Nearly every man-made object (1)_____ (2)_____ of, or at least (3)_____ its very structure, to this wonder compound. Rain slickers, computer terminals, automobile engine parts, coffee cups (and the sugar stirrers too), breast implants, toy soldiers—they are all made up of plastic, or one of its many (4)_____ Since the (5)_____ of civilization, humankind bas been experimenting (6)_____ a multifunctional material—one that had to be equally strong and lightweight—to carry, contain and protect valuables. (7)_____ it could carry, contain and protect humans too, even better. Generations of tinkerers and scientists set off (8)_____ the challenge, striking gold some 170 years ago. By mixing natural rubber with sulphur they created the world"s most utilized material ever. In developing a (9)_____, malleable and durable substance, the most important inventions of the industrial age were to follow shortly thereafter. The automobile and airplane industries, to (10)_____ just two, owe their very existence to plastic. And, (11)_____ celluloid plastic strips, the Lumiere Brothers would never have brought moving pictures to the big screen. The development of plastic is a story of human (12)_____, ingenuity and luck. (13)_____ the legend now goes, in 1839, the American inventor Charles Goodyear (the famous tyre company would later use his name) was experimenting with the sulphur treatment of natural rubber when he dropped a piece of sulphur-treated rubber on a stove. The heat seemed to give rubber (14)_____ properties. It was stronger, more (15)_____ to abrasions more elastic, much less (16)_____ to temperature, (17)_____ to gases, and highly resistant to chemicals and electric (18)_____ Eyeing this as a cheaply and easily reproduced construction material, a whirlwind of work (19)_____ and the birth of (20)_____ plastic and plastic-derivatives were born from camphor to celluloid to rayon; cellophane, polyvinyl chloride (or PVC); styrofoam and nylon were soon to follow.
男，43岁，肝炎肝硬化病史5年，出现腹水1年，1周来低热伴轻度腹痛，腹水明显增多。腹水检查：淡黄色，比重1．017，蛋白26g／L，白细胞数500×109／L，中性粒细胞0．80。最可能的诊断是肝硬化合并
女，28岁，间歇性上腹痛3年，近日腹痛变为胀痛，伴有呕吐，呕吐物量多，为宿食。抑酸剂治疗无效。体检上腹部有振水音，转动体位症状不能缓解。最可能的诊断是
腹部损伤时行诊断性腹腔穿刺，抽出不凝固血液，最可能的诊断为
微信支付 
支付宝支付