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【单选题】
用常系数微分方程描述的系统称为（）系统。A.
相似
B.
物理
C.
力学
D.
线形
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】Change in Fixed costs, Variable Cost and Sales Volume 4.A plan to switch salespeople from flat salary (£6,000 per month) to a sales commission of £1 per unit could increase sales by 15%. Good idea? Ye...
【单选题】Suppose you are a manager in the personal computer division of Compusell Corporation, a large firm that manufactures many different types of computers. You come up with an idea for a new type of perso...
A.
-$1,260,845
B.
-$1,360,645
C.
-$1,270,645
D.
-$1,260,645
【简答题】1. ( ) a fixed idea that people have about
what someone or something is like, especially
an idea that is wrong
【单选题】期货市场上铜的买卖双方达成期转现协议,买方开仓价格为47500元/吨,卖方开仓价格为48100元/吨,协议平仓价格为47850元/吨,协议现货交收价格为47650元/吨,卖方可节约交割成本400元/吨,通过期转现交易,买方实际购买成本和卖方实际销售价格分别为______。(不计手续费等费用)
A.
47300元/吨，48500元/吨
B.
47650元/吨，47650元/吨
C.
47300元/吨，47650元/吨
D.
47300元/吨，48300元/吨
【简答题】passage 2 Listen to a short passage three times. When the passage is read for the first time, listen for its general idea. When the passage is read for the second time, fill in the blanks with the exa...
【简答题】零声母音节是指 。
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