有一批记者乘飞机从上海来到西藏旅游，他们托运的行李与在上海时比较，行李的质量将_

随意掷一枚硬币，掷出是反面朝上的概率为___，随意掷一枚骰子，掷出是奇数的概率为__.

一常用温度计（此时银白色液柱长8cm）逐渐向平面镜靠近，在靠近的过程中，在镜中所成像长度       __（填“变大”“变小”或“不变”）.若用酒精浸湿的棉花包住温度计的玻璃泡，稍许时间后，液柱在平面镜中像的长度将      __8cm（填“大于”“小于”或“等于”）。

离心压缩机机械密封的原理是什么？

An internet is a combination of networks connected by (1). When a datagram goes from a source to a  (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a  (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?

空白（3）处应选择（）

A.destinations

B.routers

C.packets

D.computers

整体式汽车发生碰撞时，除了碰撞点的损伤外，离碰撞点很有的部位也会有损伤。