国家预算的原则
参考答案:
(1)公开性原则
(2)量入为出原则
(3)开源节流的原则
某小组有2名男生和2名女生,从中任选2名同学去参加演讲比赛,那么互斥而不对立的两个事件是 ( )
A.“至少有1名女生”与“都是女生”
B.“至少有1名女生”与“至多1名女生”
C.“至少有1名男生”与“都是女生”
D.“恰有1名女生”与“恰有2名女生”
The standard normal distribution is most completely described as a:()
A. symmetrical distribution with a mean equal to its median.
B. normal distribution with a mean of zero and a standard deviation of one.
C. distribution that exhibits zero skewness and no excess kurtosis.