严寒地区冬季使用的空气加热器，哪些防冻措施是正确的？（）A、设置空气预热器，其水路上
题型：多项选择题
问题：
严寒地区冬季使用的空气加热器，哪些防冻措施是正确的？（）
A、设置空气预热器，其水路上不设置自动调节阀
B、新风入口设密闭多叶阀或保温风阀，其启闭与风机的开停联锁
C、设置热水调节阀与风机同时启闭的联锁装置
D、热水调节阀设最小开度控制，并在必要时加大开度
题型：多项选择题
| 根据对话内容，从方框内选择合适的句子补全对话。（有两项多余） | |
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| (F=Father; T=Tom） F: Has everything been ready, Tom? (1)________ T: Yes, I think so. F: Have you packed your bag? T: (2)_________ F: Have you fed the dog? T: Oh, no. I forgot. I’ll do it now. F: Have you said goodbye to your teacher? T: (3)_________ F: Have you brought a guidebook? T: Do we need to? F: (4)_________ T: Okay. I’ll take one. F: (5)_________ Oh yeah, have you watered the plants yet? T: Mom did it. F: Now, we are ready. Let’s go! |
he telephone was busy.