甲、乙、丙和丁四个图分别表示有关量的变化规律,下列描述中,正确的是( )
A:甲图中,表示温度对人体淀粉酶催化效率的影响
B:乙图中,若a是茎的向光侧,则b点一定是茎的背光侧
C:丙图中,a、b、c和d四种组织的毛细血管的血液中,a组织中氧浓度最高
D:丁图中,若①③代表肾动脉和肾静脉,则曲线代表尿素等含氮废物的含量变化
①强化环境保护法制建设,有法可依
②坚持科学立法,履行环保责任
③增强执法刚性,依法执政
④行使决定权,推进生态文明建设
raise sell support sell out of think less than open too….to for
Brian's school life is very busy. Recently Jenny, Danny and he ____ some money for their school basketball team. Brian baked cookies and ____them in ____an hour. Danny invented a new desk but everyone thought it was ____ dangerous ____ do homework on a bicycle. Li Ming thought that____ cookies was a great idea to help others. His teacher, Ms. Liu wanted ____a shop to raise money ____ school activities. Li Ming ____his classmates would ____ the idea.
有一个容量为200的样本,其频率分布直方图如图所示,据图估计,样本数据在8,10)内的频数为( )
如图所示,固定在水平面上的斜面倾角为θ,长方体木块A的质量为M,其PQ面上钉着一枚小钉子,质量为m的小球B通过一细线与小钉子相连接,细线与斜面垂直,木块与斜面间的动摩擦因数为μ,以下说法正确的是( )