生活中难免遇到意外情况,学好生物学知识,可以帮助我们科学地应对.以下处理措施,错误的是( )
A:骨折时要用夹板固定,夹板长度应长过骨折部位上下两端的关节
B:不慎烧伤需要进行皮肤移植时,用自身皮肤能有效避免排异反应
C:用指压止血法救治较大动脉出血的伤员时,应压迫伤口的远心端
D:发现有人煤气中毒,立即打开门窗,将其移到通风处,拨打“120”后进行人工呼吸
如图,在△ABC中,AD⊥BC于点D,BD=CD,若BC=6,AD=5,则图中阴影部分的面积为 ( )
掷一枚硬币,正面朝上的概率是____.
⑴What's your favourite season?____ A. It's sunny and cool.
⑵Why do you like winter?____ B. I can swim.
⑶I like spring.____ C. Autumn.
⑷What can you do in summer?____ D. Because I can skate.
⑸What's the weather like in autumn in Beijing?____ E. Me too.
(Ⅰ)求异面直线D1E与A1D所成的角;
(Ⅱ)若二面角D1﹣EC﹣D的大小为45°,求点B到平面D1EC的距离.