7X-8<4.5是方程.______.
7x-8<4.5,虽然含有未知数,但它是不等式,因此不是方程;
故判断为:×.
补全对话(10分,每空2分)
A: You look worried. 小题1:___________________________________?
B: I have trouble learning English. 小题2:_________________________________?
A: Sure. You could watch some English movies.
B: 小题3:_________________________ ! By the way, I called you at 9 last night, but nobody answered.
小题4:________________________________________?
A: I was eating out with my family. What’s up?
B: 小题5:_________________________________________?
A: OK. Let’s meet on Sunday morning at your house and I can help you with your English.
B: Thank you very much. See you then.
A: See you.
《建筑消防安全检测评价技术规程》规定,洒水喷头安装的一般要求()
A.扑救电气火灾应为离心雾化型水雾喷头
B.现场人工控制
C.腐蚀性环境应为防腐型水雾喷头
D.粉尘场所设置的水雾喷头应有防尘罩