2008年5月12日14时28分,我国四川省汶川县发生里氏8.0级特大地震,振动

题型:选择题

问题:

2008年5月12日14时28分,我国四川省汶川县发生里氏8.0级特大地震,振动波及半个中国!灾情发生后,天翔迅速上网搜索了一些关于地震的知识:地震的频率范围大约是1HZ~100HZ;在传播途中振动的幅度逐渐衰减,而且频率越高衰减得越快。请结合这些信息在下列说法中选出错误的一项 [ ]

A.5月12日14时28分,恩施州全境也产生了强烈震感

B.发生地震时,释放出巨大的能量

C.在汶川,人们可以听见地震时发出的声音,音调比较低沉

D.在距离汶川较远的地方,人们可能感受到了震动,但可能听不到声音

考点:超声波和次声波的定义声与能量
题型:选择题

根据短文内容,判断下面句子正(T)、误(F)。

This is a picture of a classroom. The classroom is big and clean. You can see a teacher’s desk, five desks and six chairs. You can see a girl and a boy, too.

Three books are on the teacher’s desk. A pencil case is on the desk. Two pens and two rulers are in the pencil case. A school bag is behind a chair. A ball is on the floor.

The girl is Lucy, and she is eleven. The boy is Mike, and he is twelve. They are in Class Two, Grade Seven. They are friends. Their teacher is Miss Green. She is not here.

小题1:It’s a picture of a school.

小题2:You can see a girl and a boy in the picture.

小题3:Two books are on the teacher’s desk.

小题4:Lucy is twelve years old.

小题5:Lucy and Mike are in Class Two, Grade Eight.

题型:选择题

已知⊙O的直径为8cm,点A,B,C与圆心O的距离分别为4cm,3cm,5cm,则点A在______上,点B在______,点C在______.

题型:选择题

集散控制系统的网络存取控制技术分为CSMA/CD、令牌传送和()三种。

A.轮询

B.检测

C.中断

D.直接存取

题型:选择题

通信设备出厂前,应进行检查,符合要求后()签认同意后方可出厂

A.专业监理工程师

B.建设单位工程师

C.总监理工程师

D.设计师

题型:选择题

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