(1)试点 (2)公布实施　　(3)提出暂行方案 (4)发现问题　　(5)修改 A

患儿，女性，9岁，左下后牙牙龈红肿2天就诊。近1个月来患儿左下后牙咀嚼不适，无明显冷热刺激痛及自发痛史。1周前咬物时疼痛加剧，2天前左下后牙牙龈出现肿胀。临床检查发现唇侧牙龈红肿，叩痛阳性，无明显松动，无明显龋坏，无早接触，但咬合面见牙体组织折断痕迹。X线检查显示牙根发育不完全，根尖呈喇叭口状，根周硬骨板不连续。

的治疗措施是（）

A.牙龈脓肿切排

B.根管治疗

C.根尖诱导成形术

D.牙根形成术

E.以上都不是

D字形瞳孔是下列哪种病变的特征

A．外伤性虹膜根部离断

B．完全性虹膜后粘连

C．部分虹膜后粘连

D．先天性虹膜缺损

E．多瞳症

The network layer provides services to the transport layer．It can be based on either (71) ．In both cases，its main job is (72) packets from the source to the destination．
In network layer，subnets can easily become congested，increasing the delay and (73) .
for packets．Network designers attempt to avoid congestion by proper design．Techniques include (74) policy，caching，flowcontrol，and more．
The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，traffic shaping，resource (75) ，and admission control．Approaches that have been designed for good quality of service include integrated services(including RSVP) ，differentiated services， and MPLS．

A．abandonment
B．retransmission
C．checksum
D．synchronism

局域网交换机的某一端口工作于半双工方式时带宽为100 Mbps，那么它工作于全双工方式时带宽为______。

A．50 Mbps

B．100 Mbps

C．200 Mbps

D．400 Mbps

在计算企业应纳税所得额时，允许从收入总额中扣除的是（）。

A.企业内营业机构之间支付的租金和特许权使用费

B.无形资产开发支出形成资产的部分

C.被环保部门处以的罚款

D.广告费性赞助支出