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对急性咽炎的描述为（）。
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信息传播学萌芽时期的代表人物有（ ）。
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什么采收率？
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男，50岁，患肺心病4年，住院后10天感染已控制，虽持续使用利尿药，右心衰症状无改善，应选择的治疗是（）
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什么是无差异曲线？无差异曲线的特征是什么？
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我国安全生产立法规定的安全生产违法责任主体有哪些？（）
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商品作为符号，能够提供声望和表现消费者的个性、特征、社会地位以及权力，鲍德里亚称之为商品的（）。
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McDonald's, Greggs, KFC and Subway are today named as the most littered brands in England as Keep Britain Tidy called on fast-food companies to do more to tackle customers who drop their wrappers and drinkscartons(盒子) in the streets. Phil Barton, chief executive of Keep Britain Tidy,(62)its new Dirty Pig campaign, said it was the first time it had investigated which(63)made up "littered England" and the same names appeared again and again. "We(64)litterers for dropping this fast food litter(65)the first place but also believe the results havepertinent(相关的) messages for the fast food(66). McDonald's, Greggs, KFC and Subway need to do more to(67)littering by their customers." He recognised efforts made by McDonald's,(68)placing litter bins and increasing litter patrols, but its litter remained "all too prevalent". All fast food chains should reduce(69)packaging, he added. Companies could also reduce prices(70)those who stayed to eat food on their premises, offer money-offvouchers(代金券) or other(71)for those who returned packaging and put more bins at(72)points in local streets, not just outside their premises. A(73)for McDonald's said: "We do our best. Obviously we ask all our customers to dispose of litter responsibly." Trials of more extensive, all-day litter patrols were(74)in Manchester and Birmingham. KFC said it took its(75)for litter management "very seriously", and would introduce a programme to reduce packaging(76)many products. Subway said that it worked hard to(77)the impact of litter on communities,(78)it was "still down to the(79)customer to dispose of their litter responsibly". Greggs said it recognised the " continuing challenge for us all ",(80)having already taken measures to help(81)the issue.
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外伤性血胸胸腔内积血不凝固，这是因为（）
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ZY7-J170/4000直流电液转辙机动作杆动程为（）。