在固定节拍专业流水中，为缩短工期，两个相邻的施工过程应当( )。A．(A) 保持一定

简述将主模上设计和确定的义齿共同就位道准确转移到复制的耐高温模型上的方法?

目前乘客电梯使用量最大的，具有节能、效率高、驱动控制设备体积小和重量轻等优点的调速系统是（）调速系统.

A.交流变极

B.交流变压

C.变频变压

D.直流

钻井液中液相体积减少，会导致钻井液密度（）。

A、无法判断

B、下降

C、无影响

D、升高

An internet is a combination of networks connected by (1). When a datagram goes from a source to a  (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a  (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?

空白（4）处应选择（）

A.destination

B.resource

C.packet

D.source

热作模具热处理应注意什么问题？