题目内容

保留在古老岩石中的剩磁叫做();在古老沉积岩中称();在古老火成岩中则称()。

查看答案
更多问题

Which of the following technologies can be used in distance vector routing protocols to prevent routing loops?()

A. Spanning Tree Protocol
B. Shortest path first tree
C. Link-state advertisements (LSA)
D. Hold-down timers
E. Split horizon
F. VRP

铰接式旋翼在吹风挥舞时,旋翼每转一周,桨叶挥舞速度和挥舞角分别出现一次周期性变化。下面正确的是()

A. 挥舞角的变化比挥舞速度的变化滞后90度。
B. 桨叶在90度方位下挥速度最大,在270度方位上挥速度最大。
C. 桨叶在180度方位挥舞最低,在360度方位挥舞最高。

During the watch keeping at sea, the engineer in charge should notify in the event of any serious occurrence or a situation where he is unsure of the action to take()

A. the master
B. the chief engineer
C. the bridge
D. the company superintendent

简述电梯的分类。

答案查题题库