A:4−2ln2,+∞)
B:(e,+∞)
C:(−∞,4−2ln2
D:(−∞,e)
根据句意及首字母提示,完成句子.____ Now your plan is __________(clean ) the blackboard.____ When someone knocked at the door, he _________(watch) TV.____ I was busy preparing for my exam yesterday, so I couldn't help_________(do) some cleaning.____ Is he used to _________ (get) up early?____ Did you make a _________on the spring trip? (decide)
如图三视图所表示的几何体是( )
The students their pens when the teacher told them to stop writing.
学习植物生理作用的知识后,某兴趣小组设计如下实验进行探究,方法如下:
①如甲图所示,取盆栽牵牛花植株放在暗处一昼夜;
②将植株枝条上长势、大小相同的三个叶片分别置于A、B、C三个透明塑料软瓶内,密封瓶口,设为甲装置,其他处理见图;
③甲装置移到光下6小时;
④分别将A、B、C瓶的导管伸入澄清石灰水中,打开阀门,轻挤塑料瓶,观察石灰水的变化;
⑤取下三瓶内的叶片,分别用乙装置脱色;
⑥取出脱色后的叶片,漂冼后滴加碘液.