正常结膜囊最大容量为( )A．101μl B．20μl C．30μl D．40μl

口袋中有5个大小相同的小球，其中1个小球标有数字“3”，2个小球标有数字“2”，2个小球标有数字“1”，每次从中任取一个小球，取后不放回，连续抽取两次．

（I）求两次取出的小球所标数字不同的概率；

（II）记两次取出的小球所标数字之和为X，求事件“X≥4”的概率．

．Frank put the mediocre in the top drawer to make sure it would not be_______ to the kids.

A．accessible

B．relative

C．acceptable

D．Sensitive

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（2）处应选择（）

A.user

B.host

C.city

D.destination

从1915年起，四种主要的工作评价体系逐步建立起来，按时间顺序是（）、（）、（）和（）

建设工程监理合同标准条件中应包括( )等内容。

A．合同适用的法律

B．监理业务执行的起止时间

C．监理的工作范围和内容

D．合同生效、变更与终止