建筑工人在砌房子时如图所示，水平仪R来检查所砌的墙面是否水平，当液体中空气泡居中

关于骨盆的叙述，正确的是（）

A.骨盆是由骶骨、尾骨及耻骨组成

B.真骨盆两侧为髂骨翼，后为第5腰椎

C.骨盆入口平面为真假骨盆的交界面，前方为耻骨联合，两侧为髂耻缘，后方为骶岬上缘

D.骨盆出口平面由两个在不同平面的三角形组成，坐骨棘间径为两个三角形共同的底

E.中骨盆平面横径为坐骨结节间径，是分娩过程中衡量胎先露下降程度的重要标志

(2011年厦门质检)封闭在汽缸内一定质量的气体，如果保持气体体积不变，当温度升高时，下列说法正确的是(　　)

A．气体的密度增大　　　　　　

B．气体的压强不变

C．气体分子的平均动能减小

D．气体从外界吸热

甲与有夫之妇乙勾搭成 * * ，后乙因受丈夫责骂，与甲中断了关系，甲怀恨在心。一天下午，甲将乙骗至自己的住处将其杀害，当晚又潜入乙家将其丈夫杀害。甲的行为属于

A．想象竞合犯

B．继续犯

C．连续犯

D．牵连犯

Networks can be interconnected by different devices. In the physical layer networks can be connected by (31) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches which operate at data link layer. They can accept (32) , examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process. In network layer, we have routers that can connect two networks. If two networks have (33) network layer, the muter may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (34) . As an example, gateways between Internet e-mail and X.400 e-mail must (35) the e-mail message and change various header fields.

（31）是（）

A.reapers

B.relays

C.packages

D.modems

隔离开关分闸角度为90°，允许偏差为（）。

A、-1°

B、0°

C、+1°

D、+2°