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

单项选择题蜗杆传动的正确啮合条件： A、正确 B、错误