视网膜深层出血呈圆点状，色暗红，位于（）
A.神经纤维层
B.外丛状层
C.外核层
D.外丛状层和内核层之间
E.内核层
参考答案：D
—This digital camera is too expensive. I can't afford it.
—Here's another one, madam. It's _________. [ ]
A. better
B. dearer
C. cheaper
在方向继电器电路中加总取消继电器第四组后接点的作用如何？
