下列()建筑中的防火墙,其耐火极限不应低于4.0h。
A、110m高的民用建筑
B、乙类厂房
C、丙类仓房
D、乙类仓库
E、丙类仓库
F、丙类厂房
参考答案:B, D, E
用适当的疑问词填空.
1. _____ do you find difficult in learning English?
2. _____ many foreign countries have you visited?
3. _____ do you get on well with in your class?
4. If you are poor, _____ much money do you have.
5. _____ long have you lived here?
休克发生的始动环节主要是()、()和()。