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【简答题】
使用铬黑T指示剂合适的pH范围是
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【简答题】Traveling by train is usually not easy in China. It can be hard to get a ticket. When you’re traveling to the railway station, you look at your watch, for you are afraid you will miss your train. But ...
【单选题】文化不通过生物遗传获得,只能通过( )获得。
A.
保存
B.
选择
C.
整理
D.
学习
【单选题】如图,已知△ABC中,∠CAB=∠B=30°,AB=2 3 ,点D在BC边上,把△ABC沿AD翻折使AB与AC重合,得△AB′D,则△ABC与△AB′D重叠部分的面积为(  )
A.
3- 3 2
B.
3 -1 2
C.
3- 3
D.
3- 3 6
【单选题】如图,点D为△ABC边AB的中点,将△ABC沿经过点D的直线折叠,使点A刚好落在BC边上的点F处,若∠B=46°,则∠BDF的度数为(  )
A.
88°
B.
86°
C.
84°
D.
82°
【简答题】如图1,在△ABC中,D、E、F分别为三边的中点,在边AB上,△BDG与四边形ACDG的周长相等,设BC=a、AC=b、AB=c, (1)求线段BG的长; (2)求证:DG平分∠EDF; (3)连接CG,如图2,若△BDG与△DFG相似,求证:BG⊥CG。
【简答题】Traveling by train is usually not easy in China. It can be hard to get a ticket. When you’re traveling to the railway station you look at your watch, afraid you will miss your train. But there is good...
【单选题】听力原文:There's no doubt that athletes are playing hard enough to suppress immune defenses. The normal population in Australia expects to get between three and four upper respiratory infections each year...
A.
正确
B.
错误
【简答题】阅读理解。 Traveling by train is usually not easy in China. It can be hard to get a ticket. When you're traveling to the railway station you look at your watch, afraid you will miss your train. But there i...
【简答题】如图,已知点D是△ABC的边BC(不含点B,C)上的一点,DE ∥ AB交AC于点E,DF ∥ AC交AB于点F、要使四边形AFDE是矩形,则在△ABC中要增加的一个条件是:______.
【简答题】如图1,在△ABC中,D、E、F分别为三边的中点,在边AB上,△BDG与四边形ACDG的周长相等,设BC=a、AC=b、AB=c. (1)求线段BG的长; (2)求证:DG平分∠EDF; (3)连接CG,如图2,若△BDG与△DFG相似,求证:BG⊥CG.
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