题目内容

按照决策影响的时间长短,可以将决策分为()

A. 长期决策和短期决策
B. 个体决策和集体决策
C. 程序化和非程序化决策
D. 确定型、风险型和不确定型决策

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下列叙述正确的是( )

A. 两个连续周期信号的和一定是周期信号
B. 两个连续周期信号的周期之比为有理数时,其和信号才是周期信号,其周期是这两个周期信号周期的最小公倍数
C. 两个离散周期序列之和不一定是周期序列
D. 以上说法均不正确

Choose the best option to complete the sentences.Children,When______ by their parents, are allowed to enter the stadium.

A. accompanies
B. accompanying
C. accompanied
D. to accompany

Ordinary soap,_______correctly, can deal with bacteria effectively.

A. used
B. having used
C. having been used
D. using

Around 13,500 new jobs were created during the period, ______the expected number of 12,000 held by market analysis.

A. exceeded.
B. exceeding.
C.to be exceeded.
D. Exceeds

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