A．做的功越多
B．做功的本领越大
C．越省力
D．有用功与总功的比值越大
答案：D
一个长方形，它的长扩大为原来的4倍，宽不变，面积扩大为原来的______倍；长、宽同时扩大为原来的3倍，面积扩大为原来的______倍．
In relation to the management and administration of a company limited by shares:
(a) Explain the matters that fall within the exclusive competence of the board of directors. (5 marks)
