如图所示为一横波在某一时刻的波形图,已知质点F此时刻运动方向向下,则( ) A.

题型:选择题

问题:

如图所示为一横波在某一时刻的波形图,已知质点F此时刻运动方向向下,则(  )

A.波向右传播

B.质点C比质点B先回到平衡位置

C.质点C此时刻位移为零

D.质点H的运动方向与质点F的运动方向相同

考点:横波与纵波
题型:选择题

房地产行政主管部门通常设置一些投诉通道,制定投诉受理程序,以便及时有效地( )当事人解决房地产经纪纠纷。

A.引导
B.管理
C.监督
D.实现

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Eagles are members of the bird family. More than 60 kinds live in Africa. Once there was a baby eagle living in a nest on a cliff(悬崖). The baby eagle loved his nest. It was warm, soft and comfortable. And even better, he had all the food and love that his mother could give. Whenever the baby eagle was hungry, his mother would always come just in time with delicious food he liked.

He was growing happily day after day. But suddenly his world changed. His mother stopped coming to the nest. He was full of sadness and fear. He thought he would die soon. He cried, but nobody heard him.

Two days later his mother came with some nice food. The baby eagle was wild with joy. But his mother put the food at the top of the mountain and then looked down at her baby. The baby eagle cried out, “Mom, why did you do this to me? I’m hungry. Don’t you know I will die if I have nothing to eat?”

“Here is the last meal I give you. Come and get it by yourself.” his mother said. Then she flew down and pushed the baby out of the nest.

The baby eagle fell down, faster and faster. He looked up at his mom, “Why do you abandon me?” He looked down at the earth. The ground was much closer. Then something strange happened. The air caught behind his arms and he began to fly! He wasn’t moving to the ground any more. Instead, his eyes were pointed up at the sun. “You are flying! You can make it!” His mother smiled.

小题1:Which of the following is true about the baby eagle’s life before his mother stopped coming to the nest?

A.He lived in a nest in a tree.

B.His mother gave him nice food.

C.He was always cold and hungry.

D.He lived very happily with his friends.小题2:How did the eagle feel as soon as he saw his mother coming again?

A.Sad.

B.Happy.

C.Afraid.

D.Angry.小题3:What did the baby eagle’s mother do when she came the last time?

A.She put some food in the nest.

B.She just came to see him again.

C.She shouted at her baby eagle and flew away.

D.She pushed her baby eagle out of the nest..小题4:The underlined word “abandon” means _________ in Chinese.

A.抛弃

B.保护

C.歧视

D.拯救小题5:We can infer from the story that the baby eagle ___________.

A.lost his mother

B.fell down and died

C.could get food himself

D.was still angry with his mother

题型:选择题

简述施工现场防火布置要求的各区域间的防火间距。

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发生轮舱火警时,应考虑的空速为()

A.观察放起落架限制速度(280海里/小时/75马赫)

B.最大收起落架速度245海里/小时

C.观察放起落架限制速度(270海里/小时/82马赫)

题型:选择题

汽缸上下壁温差达()报警,达()时手动脱扣汽机。当温差达42℃时检查汽机()开启,目的是为了防止()。

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