A:One moment, please. I’ll see if there are any for tonight.
B:Sure. Please fill out this form for us.
C:Sorry. I’m afraid we have no one at this time
D:How long are you planning to stay here, sir?
5+2-3=____
3-1+8=____
10-5+4=____
是甲、乙、丙、丁四位同学在用低倍镜观察蚕豆叶下表皮实验时各自在视野中看到的物像,请看图回答: