【单选题】价层电子对互斥理论首先预测的形状是
B.
分子中外面原子作为顶点构成的几何形状,即分子形状
D.
分子中中心原子上价电子对远离原子核一端作为顶点构成的几何形状
【单选题】—Dad, I don’t think Oliver the right sort of person for the job. —I see. I’ll go right away and ________.
【简答题】Java.net中提供了两个类:( )和Socket,它们分别用于服务器端和客户端的socket通信。
【单选题】Each open lifeboat carried on a vessel on an international voyage must have().
B.
a davit span with at least 2 lifelines
【单选题】某带权有向图如图3-67所示。 若忽略边上的权,并将其看做AOV网,那么该AOV网的拓扑排序为(1)。若将该图视为AOE网,那么该AOE网的关键路径有(2)条,其长度为(3)。该AOE网的所有关键活动共有(4)个,V5的最早开始时间和最迟开始时间分别是(5)。
A.
V1、V2、V3、V4、V6、V5、V7、V8
B.
V1、V3、V5、V2、V4、V6、V7、V8
C.
V1、V2、V3、V4、V5、V6、V7、V8
D.
V1、V2、V3、V5、V6、V4、V7、V8
【单选题】The Muster List (“Station Bill”) shows each person’s lifeboat station,duties during abandonment,basic instructions,and().
B.
instructions for lowering the lifeboats
C.
the time each weekly drill will be held
【简答题】What should be done to make sure that medicines are on board each lifeboat?
【单选题】Each year the two friends wrote to each other less and less and eventually their friend-ship__________.