- 搜标题
- 搜题干
- 搜选项
单项选择题
A． 
approaching from the direction less than L
B．
approaching from the direction greater than L
C．approaching from the direction greater than L or less than L alternatively
D． In any way
approaching from the direction less than LB．
approaching from the direction greater than LC．
approaching from the direction greater than L or less than L alternativelyD． In any way
