在收敛域之外，信号的拉普拉斯变换不存在

A、A.无筋扩展基础

B、B. 筏板基础

C、C.钢筋混凝土基础

D、D.桩基础

E、E.扩展基础

A、继电器

B、互感器

C、传感器

D、接触器

A、谱线沿频率呈离散分布

B、相邻谱线间的距离正好等于基波频率，不可能包含不是基波频率整数倍的其他频率分量

C、周期信号属于功率信号

D、双边相位频谱是关于频率的偶函数

Forthe 2002 General Social Survey, counts in the happiness categories (not, pretty, very) were (6,43,75) for below average income, (6,113,178) for average income, and (6,57,117) for above average income. Table shows output for a cumulative logit model with scores{1,2,3}for the income categories. a. Explain why the output reports two intercepts but one income effect. b. Interpret the income effect. c. Report a test statistic and P-value for testing that marital happiness is independent of family income. Interpret. d. Does the model ?t adequately? Justify your answer. e. Estimate the probability that a person with average family income reports a very happy marriage.

A、（11011001）2

B、(75)10

C、(37)8

D、(2A)16

A、六乐

B、礼乐

C、司乐

D、音乐