按齿轮的形状分类有（）和（）两大类。
参考答案：圆柱齿轮；圆锥齿轮
With reference to the Companies Law Cap. 113, explain the rules governing the following in relation to private companies:
(b) reduction of share capital. (5 marks)
下列X线征象，不属于法洛四联征的是（）
A.肺血减少
B.两肺门动脉细小
C.主动脉升弓部增宽、凸出
D.心脏近似靴形
E.肺动脉段一心腰部膨隆，心尖圆隆
