数学期望与时间无关，为常数的应该是狭义平稳随机过程的特征。
参考答案：错
— How many students, do you think, will be present at the meeting?
— I expect _____ 200 students. [ ]
A. there being
B. there been
C. there be
D. there to be
我国机动车辆保险的基本险包括（）。
A.车辆损失险和全车盗抢保险
B.车辆损失险和车上责任保险
C.车辆损失险和第三者责任保险
D.车辆损失险和无过失责任保险
