高空拆模时,除操作人员外下面不得站人,并应设置()或红色信号标志。
参考答案:警示牌
根据对话内容及图片补全对话。
Father: Mike, yesterday you told me that you will have a Chinese test today. Why are you still in bed?
You should get up and get ready 1_____ school. If you don't hurry up, you'll be late.
Mike: I don't 2_____ very well.
Father: Oh, dear! What's the matter?
Mike: I don't know. I have a stomachache.
Father: Really? If you are 3_____, you'll have to 4_____ the doctor.
Mike: Can I have some breakfast?
Father: No, you 5_____ eat anything until you see the doctor.
Mike: Dad, I feel a little better now.
简支梁桥按横截面型式可分为()
A、板桥
B、肋梁桥
C、组合式梁桥
D、箱形桥