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问题 单项选择题

全冠口内试戴时应检查的问题是

A．咬合、就位

B．就位、龈边缘

C．龈边缘、咬合、就位

D．接触点、咬合、就位

E．接触点、咬合、就位、龈边缘

答案

参考答案：E

解析：全冠口内试戴时，接触点、咬合、就位、龈边缘都是必须检查的问题。

单项选择题

心包摩擦音在下列哪种体位最易听到（）

A.坐位前倾

B.仰卧位

C.左侧卧位

D.俯卧住

E.头部后仰位
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单项选择题

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 desing,Techniques include （74） policy，caching，flow control，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), differentiatd services, and MPLS.

空白处（74）应选择（）

A．abandonment

B．retransmission

C．checksum

D．synchronism
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