Can not open seriaI port

Can not open seriaI port Can not open output can not open phrasel是什么意思 can not call method open of undefined OH NO!You can not open it! cat:can't open '/dev/fb0':Operation not permitted Do not smash the door open;I can find the The children can not wait _____(open) the present Proteus 仿真时出现can not open C.LISA3199.SDF Can not open CiZu.是手写板上的 Enter your seriai key 通过1062液晶屏显示的电子密码锁,在keil中老是显示can't not open file 'lcd.h' can't not open 'key.h ' seriai Number 翻译是什么意思啊? －－I can't open the front door.----Why not try ___the back door?A.open B.to open C.opening答案为什么是C? i can't open the front door.Why not try ___the back door?A open B to open C opening D to opening they do not have legs but they can move fast.they can move fast.They can open their mouths really do not open unit isn't open/ doesn't open怎样判断用哪个,看清楚啊,不是两者的区别isn't open/ doesn't open 例句：the swiming pool -----(not open)we can't go toswim.要解析