The April 10, 2010 air crash, with a Russian Tu-145 plane _______ Poland’s president Lech Kaczin
A.
22. The April 10, 2010 air crash, with a Russian Tu-145 plane _______ Poland’s president Lech Kaczinsky, his wife and many Polish government and military officials, shocked the whole world. A.carried
【简答题】水火箭模拟火箭发射原理,如图所示. 水火箭发射高度与哪些因素有关呢?某科技兴趣小组提出如下假设并进行实验.假设: ①与打气筒的型号有关;②与瓶内水的多少有关;③与瓶的容积有关. 实验器材如下表所示. 雪碧瓶(容积) 打气筒(型号) A B C D E F O.6升 1.25升 2.5升 小号 中号 大号 (1)该小组设计了如下甲、乙两种方案验证假设①,你认为较合理的方案是______; 甲方案选用...