题目内容
测得含某声源的环境噪声值为53dBA,关闭某声源时背景噪声值为50dBA,则声源噪声为()。
A43dBA
B45dBA
C50dBA
D51dBA
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在多少度的高温环境下,温度的升高就会伤害皮肤基础组织()
A 50度以上
B 51度以上
C 46度以上
D 45度以上
甲、乙公司生产和销售完全相同的产品，市场需求为p=100－q。两公司的边际成本都是常数．他们以伯特兰的方式竞争。 (1)如果甲、乙两公司的常数边际成本分别为20和58，有没有市场均衡？市场的均衡价格是多少？ (2)如果甲、乙两公司的常数边际成本分别为10和58，有没有市场均衡？市场的均衡价格是多少？
参考答案：错误
假设某种不支付红利的股票的市价为25元，年波动率为25％，无风险利率为5％，该股票期权的协议价格为22元，有效期5个月。 (1)如果该期权为欧式看涨期权，求该期权的价格； (2)如果该期权为美式看涨期权，求该期权的价格； (3)如果该期权为欧式看跌期权，求该期权的价格； (4)用以上答案检验看涨、看跌期权平价。
参考答案：错误
South-East Asias low-cost airlines have gone from feast to famine. Cheap, short-haul, no-frills flying came【C1】______to the region, but people have【C2】______it eagerly. In just ten years,【C3】______the Centre for Asia Pacific Aviation(CAPA), a research firm in Sydney, low-cost carriers share of the regions aviation market has【C4】______from almost nothing to 58%. In Europe, where cheap airlines have been flying for much longer, Easy Jet and its fellows【C5】______only about 40% . Now South-East Asias skies are looking【C6】______ The rise of low-cost carriers reflects potential demand for flying in an increasingly【C7】______part of the world. This year another 12 such airlines may join the 47 already flying in the Asia-Pacific【C8】______This week it was【C9】______that Beijing is planning a new, $ 14 billion airport. In South-East Asia【C10】______has been particularly strong: many of its 600m people live in large archipelagic countries,【C11】______Indonesia and the Philippines, where flying is the easiest way to get around.【C12】______the worlds 15 busiest low-cost international【C13】______, nine are in South-East Asia. All this demand requires aeroplanes: CAPA says South-East Asia is the only region where there are more planes on order than in【C14】______fleets. 【C15】______, the expansion of airlines capacity seems to be getting ahead of the growth in demand. Some low-cost carriers are【C16】______to fill their seats. More luxurious airlines are feeling the trouble, too: this week Cathay Pacific said that【C17】______strong long-haul profits, competition from budget airlines was starting to【C18】______it on short-haul routes. Singapore Airlines expressed【C19】______worries earlier this month. Con Korfiatis, former boss of Jetstar Asia, the low-cost arm of Australias struggling Qantas,【C20】______that "the growth in the market will definitely be there, its just a matter of introducing too much capacity too soon. "
【C1】
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