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【单选题】
函数【图片】在点【图片】处连续是函数【图片】在该点处存在偏导数的（ ）A.
充分但非必要条件
B.
必要但非充分条件
C.
充分必要条件
D.
既不是必要，也不是充分条件
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举一反三
【判断题】Firms that practice product differentiation gain competitive advantage through the way they design their channel's coverage, expertise, and performance.
A.
正确
B.
错误
【单选题】Some firms have cut workers’pay below the level set in their contract, a _______ that is illegal in Germany.
A.
habit
B.
tradition
C.
practice
D.
training
【单选题】Ad man Rosser Reeves believes that firms should develop a USP for each brand and stick to it. For what does USP stand?
A.
unique selling proposition
B.
universally strategic practice
C.
unique services practice
D.
unique sales pitch
E.
unique selling product
【简答题】相同情况下,AM、DSB-SC、SSB、VSB、FM这5种调制系统中,有效性最好的是_______,有效性最差的是_______,可靠性最好的是______。
【简答题】Wall Street firms have traditionally compensated their traders with a share of the trading profits that they generated. How might this practice have affected traders’ willingness to assume risk? What ...
【单选题】The MM theory with taxes implies that firms should issue maximum debt. In practice, this does not occur because
A.
debt is more risky than equity
B.
bankruptcy is a disadvantage to debt.
C.
the weighted average cost of capital is inversely related to the debt-equity ratio.
D.
the weighted average cost of capital is directly related to the debt-equity ratio.
【判断题】为了提高AM系统的调制效率,可采用DSB-SC调制;为了提高DSB-SC系统的有效性,可采用SSB调制;SSB设备复杂,存在技术难点,而VSB调制的滤波器较容易设计。
A.
正确
B.
错误
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