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【单选题】
4 The sales process, a standard eight-step plan of action, creates a: (1.4)A.
series of events in which the buyer commits to the salesperson several times
B.
series of presentations on the features of the product
C.
chain of opportunities for the salesperson to ask for money
D.
method that ensures that the buyer will purchase a product
E.
method that requires salespeople to do more research than necessary
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举一反三
【单选题】关于连续时间信号的幅度谱和相位谱,以下叙述正确的是
A.
幅度谱和相位谱都是时间的偶函数
B.
幅度谱是偶函数，相位谱是奇函数
C.
幅度谱是奇函数，相位谱是偶函数
D.
幅度谱和相位谱都是时间的奇函数