问题
选择题
—Where does your uncle work, Jack?
—In a ________ in Paris. He is a policeman.[ ]
A. TV station
B. book store
C. post office
D. police station
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—Where does your uncle work, Jack?
—In a ________ in Paris. He is a policeman.[ ]
A. TV station
B. book store
C. post office
D. police station
答案：D
服从自由度为n的t分布，则当
k=______．