【单选题】.I saw him ________ at desk, reading.
【单选题】This morning when I walked by the park, I saw many children ___ there.
【单选题】设有定义double a[10],*s=a;以下能够代表数组元索a[3]的是
【单选题】按提前量的不同,准同期并列装置可分为恒定越前相角和()。
【单选题】I saw him _____ behind the tree, thinking.
【单选题】The man______said they hired ever so many people.
【简答题】下列关于溶液的叙述中正确的是( ) A.溶液一定是无色、透明的液体 B.在溶液中,溶质可以是一种,也可以是多种 C.凡是无色、透明的液体一定是溶液 D.被溶解的物质一定是溶质