题目: 高频保护使用的频率越高其通道衰耗越小。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0703/05dd9a91b0d580c2cd92bf074b7da98b.html 下面是错误答案,用来干扰机器的。参考答案:B
题型:阅读理解 阅读理解。 There once lived in Greece a learned man. He was so well known for his wide knowledge of almost everything that lots of people from all over the country came to learn things from him. The great mantaught his students whole-heartedly and answered their questions with great patience. (耐心) One day a student asked him, "My dear teacher, didn't you say you yourself have many, many more questions about things than we do? On the contrary (恰恰相反), we students have far more than you." With a smile, the teacher drew two circles-one as large as a big wheel (轮子), the other smaller. "Of course, I've learned much more. But a teacher does not necessarily have fewer questions than his students. Now look at these two cricles. Within the big one is my knowledge of things, and withinthe smaller one yours. Out of the cricles is what is still unknown to us. Since mine is larger, the linethat marks out (划……的界限) the circle is longer. That means I have more chances to face what is still unknown. And that's why I myself have more questions than you do. The more you learn, the morequestions you have. You will never learn enough, you know." 1. One of his students didn't agree that ______. [ ]A.the teacher should have so many questions B.the teacher had more questions than the studentsC.the students had more questions than the teacherD.the teacher had as many questions as the students2. Which of the following pictures tells rightly what the teacher drew? [ ]A.B.C.D.3. The teacher drew two circles in order to show ______. [ ]A.he knew a lot and was good at drawing B.how one could get more knowledge C.why he had more questiones than the studentsD.what the students learned had something to do with the circles 4. The passage mainly tells us that ______.[ ]A.we should learn from a learned man B.we'll never learn enough C.a teacher should be patient D.it is never too old to learn 5. The teacher was very famous for______.[ ]A.his patience B.the drawing of two circles C.his help to tire students D.his knowledge g 查看答案
题型:选择题 下列有关命题的说法正确的是( )A.“x2=1”是“x=-1”的充分不必要条件B.“x=2”是“x2-5x+6=0”的必要不充分条件C.命题“∃x∈R,使得x2+x+1<0”的否定是:“∀x∈R,均有x2+x+1<0”D.命题“若x=y,则sinx=siny”的逆否命题为真命题 查看答案