超声波检测的优点是（）。A、探测深度大B、检测速度快C、费用低D、以上都对

衔接最恰当的一项是[ ]

狄杜勃然大怒，再次下令将俘虏扔进海里，但是奴隶们依旧安然无恙 。______________

A．狄社以为奴隶们受神灵保佑，屡俺不死，大惊失色，只好将他们全部释放。

B．狄杜大惊失色，只好下令将他们全部释放，因为他以为奴隶们受神灵保佑，屡淹不死。

C．奴隶们屡俺不死，狄社以为奴隶们受神灵保佑，大惊失色，只好下令将他们全部释放。

D．狄社大惊失色，以为奴隶们受神灵保佑，屡淹不死，只好下令将他们全部释放。

锥齿轮齿向精度差的主要原因是（）。

A、分度不正确

B、齿槽深度过大

C、分度头主轴轴线与切削方向不平行

D、齿槽宽度过大

女性，42岁，主因咳嗽、胸骨后不适1月余来院就诊，胸片示中纵隔气管旁4cm×4cm肿物，界限清楚，表面光滑，无分叶毛刺，密度均匀，无钙化。

对该患者最佳的治疗方案为（）。

A.对症抗炎，继续观察

B.经纤维支气管镜穿刺

C.CT引导下穿刺

D.胸腔镜手术切除

E.纵隔镜手术切除

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (11) 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 (12) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (13) network layer, the router 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 (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

15（）

A.analyze

B.parse

C.delete

D.create

我国《商业银行法》明确规定商业银行不得从事( )业务，国家另有规定除外。 ①不动产投资 ②信托业务 ③股票业务 ④非银行金融机构和企业投资

A．①②③④

B．②③

C．③④

D．②③④