问题 名词解释

根轨迹实轴上的会合点(或分离点)

答案

参考答案:

几条根轨迹在s平面上相遇后又分开(或分开后又相遇)的点,称为根轨迹的分离点(或会合点)。

完形填空
A woman is going shopping. She is going  46  boat. The boat is going across(穿过)the river. Her basket is empty(空的). Oh dear! Look! Her basket is in the  47  .“Help!”she says.“Look! My basket is in the river.”
A boy sees the basket. He says, “Don’t worry! I can  48  it! I’m a very good swimmer.” He takes off his shoes and shirt. “Look  49  my shirt and shoes, please!” he says and then jumps into the river.
A  50  sees the basket. “I can go by basket!” it thinks. It gets to the basket. The boy  51  in the river. “Where’s the basket?” he calls:“It’s over there!” calls the woman. “It’s behind you!” It’s  52  that duck! The boy gets to the basket.“Go away!” he says to the duck. The duck  53  out of the basket and swims away. The boy takes the basket to the land. “Oh, thank you!” says the woman. “Thank you very much!”
“Not at all!” says the boy.“  54  you like to give me my shirt and shoes?”
“Yes, here you are. Oh, what’s in the basket? It’s the duck’s  55  .”
小题1:
A.onB.inC.byD.to
小题2:
A.waterB.boatC.shipD.tree
小题3:
A.cleanB.buyC.doD.get
小题4:
A.afterB.atC.forD.like
小题5:
A.dogB.chickenC.duckD.monkey
小题6:
A.is fishingB.is swimming C.is playingD.is flying
小题7:
A.besideB.underC.onD.behind
小题8:
A.climbsB.comesC.jumpsD.walks
小题9:
A.AreB.DoC.WouldD.Could
小题10:
A.meatB.hairC.handD.egg
单项选择题