请用“高”或“低”回答下列实验中的问题： （1）酒精灯的外焰温度________

阅读下列材料，回答有关问题：

材料一  科学工作者将一种矮秆（抗倒伏）但不抗锈病的小麦与另一种高秆（不抗倒伏）但抗锈病的小麦作亲本进行杂交，后代中出现了矮秆抗锈病，矮秆不抗锈病，高秆抗锈病和高秆不抗锈病四种类型，选矮秆抗锈病类型进行繁殖培育，经若干代后，便获得了矮秆抗锈病的小麦新品种．

材料二  科学家利用返回式卫星搭载普通青椒种子，返回地面后再进行选育，培育成果实个大，肉厚，口感好，产量高的太空椒．

（1）性状从亲代传给子代的现象叫______，材料一中出现的矮秆抗锈病小麦，这种现象叫______．

（2）矮秆抗锈病小麦新品种的培育和太空椒的培育原理有所不同，前者是用______的方法来育种，而后者是利用宇宙射线使种子中的______发生改变．

公司合并或者分立，依照法律、行政法规的规定，由职工代表大会批准。 ( )

委托监理服务合同按双方签署的合同协议书上注明的时间终止；按照委托监理服务合同的规定结清监理服务费用后自然失效。

One of the most widely used routing protocols in IP networks is the Routing Information Protocol(RIP)．RIP is the canonical example of a routing protocol built on the (71) algorithm．Routing protocols in internetworks differ slightly from the idealized graph model．In aninternetwork，the goal of the routers to forward packets to various (72) ．
Routers running RIP send their advertisement about cost every (73) seconds．A router also sends an update message whenever an update from another router causes it to change itsrouting table．
It is possible to use a range of different metrics or costs for the links in a routing protocol．RIP takes the simplest approach，with all link costs being equal (74) Thus it always tries tofind the minimum hop route．Valid distances are 1 through (75) ．This also limits RIP torunning on fairly small networks．

A．computers
B．routers
C．switches
D．networks

引导接车时引导信号应在（）信号机后及时关闭。

A.列车头部越过

B.列车头部接近

C.列车尾部越过

D.列车中部越过