（）、周期和电角频率都是反映交流电重复变化快慢的物理量。A、频率 B、电压 C、电流 D、 发布时间：2018-10-21 02:15 │ 来源：www.tikuol.com 题型：单项选择题 问题： （）、周期和电角频率都是反映交流电重复变化快慢的物理量。A、频率B、电压C、电流D、相角
题型：单项选择题 完形填空。 John is a famous writer now. But he said he was not a 1 student when he was young. He was often late for 2 and didn't like doing his homework. Sometimes, he slept in class while the teacher was teaching. He didn't understand much, 3 he always thought he understood everything. One day the teacher 4 the students a question. "When Jack was tenyears old, 5 brother Bob was twenty. Jack is fifteen now and 6 is his brother Bob? " John said, "That's easy. Bob is twice as old as Jack, so he is now thirty. " Another time, the 7 in a science class asked, "When it thunders (打雷) , 8 do we always see the light before we 9 the sound?" "But, Miss," said John quickly. "don't you 10 our eyes are in front of our ears?"( )1. A. good ( )2. A. work ( )3. A. so ( )4. A. answered ( )5. A. your ( )6. A. how many ( )7. A. teacher ( )8. A. what ( )9. A. break ( )10. A. read B. tall B. lunch B. and B. asked B. my B. how old B. farmer B. when B. hear B. hope C. rich C. class C. but C. told C. his C. how much C. nurse C. why C. make C. know 查看答案
题型：单项选择题 延性结构的设计原则为（）。A．小震不坏，大震不倒B．强柱弱梁，强剪弱弯，强节点，强锚固C．进行弹性地震反应时程分析，发现承载力不足时，修改截面配筋D．进行弹塑性地震反应时程分析，发现薄弱层、薄弱构件时，修改设计 查看答案