题目: 如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为( )A.mgtgθB.mgsinθC.μmgD.μmg 答案: 答案:A
题型:完形填空 完型填空 Hello, everyone. Look 1 this picture. It's 2 old picture. Who's this man? 3 my father. He's ateacher. 4 this is my mother. She's a' teacher, too. 5 they English? No. 6 Americans. Who's this baby? It is 7 . 8 I cute(可爱)? Now I'm 13 years old.l'm a middle school 9 .1 love 10 parents. I lovethe family.( )1. A. at ( )2. A. a ( )3. A. His ( )4. A. But ( )5. A .Is ( )6. A. They ( )7. A. me ( )8. A. Is ( )9. A. student ( )10. A. your B. in B. an B. He B. That B. Are B. There are B. my B. Am B. teacher B. her C. on C. / C. She's C. And C. Am C. We're C. you C. Are C. father C. my D. of D. the D. He's D. Or D. Do D. They're D. him D. Do D. cousin D. I 查看答案
题型:单项选择题 某公司生产销售一款新车,该车在有些新设计上不够成熟,导致部分车辆在驾驶中出现故障,甚至因此造成交通事故。事后,该公司拒绝就故障原因做出说明,也拒绝对受害人提供赔偿。该公司的行为未侵犯了消费者的哪项权利?A.安全保障权B.知悉真情权C.公平交易权D.获取赔偿权 查看答案
题型:单项选择题 按照屋顶的形式来划分中国古代建筑物等级,下列哪一组符合由高到低的等级顺序( )A.重檐歇山、重檐庑殿、单檐攒尖B.单檐歇山、单檐攒尖、悬山C.单檐攒尖、单檐歇山、硬山D.单檐庑殿、重檐歇山、重檐攒尖 查看答案