可以用H++OH-=H2O表示的离子反应是[ ] A.碳酸氢钠溶液和烧碱溶液反应 发布时间:2017-04-30 06:50 │ 来源:www.tikuol.com 题型:选择题 问题: 可以用H++OH-=H2O表示的离子反应是[ ]A.碳酸氢钠溶液和烧碱溶液反应 B.醋酸和氢氧化钾溶液反应 C.硫酸氢钠溶液与苛性钠溶液反应D.稀硫酸和氢氧化镁反应
题型:选择题 小信使,快帮作者写完这封回信吧! Hello, how are you? I'm very 1 , thanks. Let me introduce my family to you. 2 five people in my family. My 3 name is Mary. She is 14 4 old. She likes to 5 the piano. My mother 6 a doctor. She works in 7 American hospital. She 8 to work by bike.( ) 1. A. OK ( ) 2. A. There is ( ) 3. A. brothers( ) 4. A. years ( ) 5. A. playing ( ) 6. A. is ( ) 7. A. a ( ) 8. A. go B. well B. Has B. sister B. year B. play B. are B. an B. going C. good C. There are C. sister's C. than C. plays C. am C. / C. goes 查看答案
题型:选择题 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 查看答案
题型:选择题 一牙周病患者,全口牙拔除两周后即做全口义齿修复,半年后义齿固位差,张口说话易脱落。最可能的原因是A.人工牙排列偏唇颊侧B.颌位关系错误C.垂直距离过高D.基托边缘过度伸展E.牙槽嵴吸收 查看答案