设为总体的一个样本,为样本均值,则下列结论正确的是( ) A.
B.
C.
D.

单项选择题Determine the value(s) of h such that the matrix is the augmented matrix of a consistent linear system. A、 B、 C、 D、

单项选择题（山东省英语专升本考试, 2017）He doesn’t have enough ______, while his father is _____ in repairing cars. A、experiences; experience B、experiences; experienced C、experience; experience D、experience; experienced