当路程s一定时,速度v与时间t之间的函数关系是[ ] A.正比例函数 B.反比例 发布时间:2017-05-25 12:44 │ 来源:www.tikuol.com 题型:选择题 问题: 当路程s一定时,速度v与时间t之间的函数关系是[ ]A.正比例函数B.反比例函数C.一次函数D.无法确定
题型:选择题 My brother Jerry works at a clothes shop. He works very hours every day. He usually at six in the morning. Then he starts to for ten minutes. He thinks running is for his health. After that, he plays for fifteen minutes. Then he has breakfast. After breakfast, he takes a bus to work. He is very busy. He has no time home for lunch, so he eats at the shop. In the afternoon, he for four hours. He has dinner at home. On weekends, he is not so . He usually goes to see a film me.小题1:A.longB.bigC.shortD.small小题2:A.goes homeB.gets upC.goes to workD.eats breakfast小题3:A.speakB.swimC.singD.run小题4:A.happyB.goodC.fun D.difficult小题5:A.badminton B.the volleyball C.violin D.the basketball小题6:A.goB.goes C.going D.to go小题7:A.themB.himC.it D.us小题8:A.stands B.waitsC.works D.buys小题9:A.busy B.free C.happy D.tired小题10:A.at B.withC.for D.to 查看答案
题型:选择题 某兴趣小组同学将CO2分别通入澄清石灰水和氢氧化钠溶液中,观察到前者变浑浊,后者无明显现象.(1)写出上述澄清石灰水变浑浊的化学方程式______.(2)为探究CO2和NaOH是否发生了化学反应,王强设计了如图所示的A、B实验,验证CO2与NaOH溶液发生了化学反应.试验现象为:A中试管内液面上升,B中______.李莉提出质疑,她认为A实验不严谨,应做一个对比实验是______.杨红认为也可以向B实验后的溶液中加入无色酚酞,若不变色,则证明NaOH与CO2发生了反应,可行吗?______(填“可行”、“不可行”),理由是______. 查看答案