据图中的实验常用仪器回答有关问题. (1)仪器F的名称是 . (2)若用KMnO4加热制取氧气,应选用上述仪器中的 (填序号);其化学反应方程式为 ;当用铁夹固定好试管后,要使试管口略低于试管底部,应调节螺旋 (填“K1”、“K2”或“K3”);要调节试管与酒精灯相对高度,应调节螺旋 (填“K1”、“K2”或“K3”). (3)若用废铁片与稀盐酸反应制取氢气,并装配一个使反应随时发生和停止的装置,应选上述仪器中的 (填序号);若需测My sister met him at the cinema yesterday afternoon,
so he your lecture.
A.couldn’t have attended B.needn’t have attended
C.mustn’t have attended D.shouldn’t have attended