有关角膜的描述，错误的是
A．无色透明
B．富有血管
C．占眼球外膜的前1／6
D．感觉神经末梢丰富
E．有屈光作用
参考答案：B
请总结出膨胀阀和膨胀管制冷循环的异同点。
Why did Tom go to school on foot [A] Because he didn’t catch the bus. [B] Because he got up very early. [C] Because he wanted to do exercises.
