为使输出电压稳定，稳压电源的输出电阻应愈大愈好。
参考答案：错
Those flowers _____ Kate $56.[ ]
A. paid
B. took
C. cost
D. spent
城市燃气供应中压管网输送压力为( )。
A．5kPa＜p≤150kPa
B．150kPa＜p≤300kPa
C．300kPa＜p≤800kPa
D．800kPa＜p≤1000kPa
