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一般认为气态污染物的采样效率（）以上为宜，采样效率太低的方法和仪器不能选用。
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【简答题】Sam Higgins was a famous photographer. He travelled all over the world, taking photos for magazines and newspapers. He had photographs of earthquakes, forest fires, floods, even wars. If something int...
【单选题】he photographer told them that he had been asked to submit his 10 best pictures for a beauty contest run by the Nazis. The meaning of "submit" here is ______
A.
顺从；服从
B.
提交，呈送
C.
感受；忍受
D.
主张；建议
【单选题】The photographer told them that he had been asked to submit his 10 best pictures for a beauty contest run by the Nazis. The meaning of "submit" here is ______
A.
顺从；服从
B.
提交；呈送
C.
感受；忍受
D.
主张；建议
【简答题】Denny Crook was a famous photographer. He traveled all over the world, taking pictures for magazines and newspapers, and won many prizes. “I’ll do anything to get a good photo,” he often said. “I’ll g...
【多选题】以下关于投资组合保险策略的说法正确的是( )。
A.
投资组合保险策略是在将一部分资金投资于无风险资产从而保证资产组合最低价值的前提下,将其余资金投资于风险资产,并随着市场的变动调整风险资产和无风险资产的比例,同时不放弃资产升值潜力的一种动态调整策略
B.
当投资组合价值因风险资产收益率的提高而上升时,风险资产的投资比例随之下降;反之则提高
C.
投资组合保险的一种简化形式是固定比例投资组合保险。此外还包括以期权为基础的投资组合保险等形式
D.
固定比例投资组合保险的主要思想是假定投资者的风险承受能力将随着投资组合价值的提高而不变,同时假定各类资产收益率不发生大的变化
【简答题】The photographer told them that he had been asked to submit his 10 best pictures for a beauty contest run by the Nazis. (Para. 14)
【简答题】The photographer told them that he had been asked to submit his 10 best pictures for a beauty contest run by the Nazis. So were 10 other outstanding photgrphers in Germany. And he sent in Hessy's pict...
【简答题】The photographer told them that he had been asked to his 10 best pictures for a beauty run by the Nazis.
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