为预防人员触电，架空线的分段开关干线长度应大于（）米。
A、500
B、400
C、300
D、200
参考答案：A
-Can you believe I had to pay 30 dollars for a haircut?
-You should try the barber's ______ I go. It's only 15. [ ]
A. as
B. which
C. where
D. that
什么是使用与满足的预期价值理论？
