在布置测线时，一般主测线应（）构成走向；联络线应构造起向.

已知函数y=f（x）是R上的奇函数，函数y=g（x）是R上的偶函数，且f（x）=g（x+2），当

0≤x≤2时，g（x）=x﹣2，则g（10.5）的值为[ ]

A．﹣1.5

B．8.5

C．﹣0.5

D．0.5

道砟桥面梁上碎石道床、枕底道砟厚度，木枕地段不小于（）。

A、20cm

B、25cm

C、30cm

D、35cm

下面有关工程质量事故发生后监理工程师处理工程质量事故的说法错误的是( )。

A．工程质量事故发生后，总监理工程师应签发《工程暂停令》，并要求停止进行质量缺陷部位和与其有关联部位及下道工序施工

B．组织并参加事故调查组的调查工作，并在调查结束后写出事故调查报告

C．要求施工单位在质量事故发生后保护好现场，防止事故扩大

D．技术处理方案核签后，监督施工单位实施，并进行验收

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.

（32）是（）

A.frames

B.packets

C.packages

D.cells

高温、腐蚀严重的场合宜选用（）的钢丝绳。