市场法的理论依据是房地产价格形成的替代原理。( )
参考答案：对
The teacher talked in a very low voice_____make himself________, clearly.
A．in order to; hear
B．so as not; hear
C．in order not to; heard
D．so that to; heard
汽车空调制冷剂R134a与R12比较，燃烧性质的特点是（）。
A、不易燃烧
B、更易燃烧
C、两者均不可燃
D、都易燃烧
