计算：(5+3)2+(5-3)2．

何谓前置胎盘及宫外孕？

(31) data effectively is crucial for success in today’s competitive environment. Managers must know how to use a variety of tools. Integrated data takes information from different sources and puts it together in a meaningful and useful way. One of the difficulties of this is the (32) in hardware and software. (33) integration uses a base document that contains copies of other objects. (34) integration uses a base document that contains the current or most recent version of the source document it contains. (35) provides an overview of the program written in "plain" English, without the computer syntax.

A．Linked

B．pointed

C．Dynamic

D．Static

随着科技的日新月异，互联网的日益盛行，网上商店遍地开花，网上购物正在悄悄地改变着人们的生活方式。对于网上购物的正确认识是（）

A.可以节省流通中所需要的货币量，从而节约社会劳动

B.使得商品交换的结算方式发生了变化

C.只需要观念上的货币，而不需要现实的货币

D.意味着电子货币将代替纸币，使货币职能发生了本质性的变化

在以太网中，采用粗同轴电缆的长度限制在500m，为了扩充总线长度，在物理层上可以采用的最简单的方法是使用 (41) 。

A．Modem

B．路由器

C．网桥

D．中继器

试述坍塌抢险的注意事项。