A级分隔应用认可的不燃材料隔热,在规定时间内,其背火一面的平均温度,较原始温度增高不超过140℃,且在任何一点包括任何接头在内的温度较原始温度增高不超过225℃。
参考答案:错
Would you please _____ forget _____ your books to the school. [ ]
A. don't, to take
B. not, taking
C. not, to bring
D. don't, bringing
转化炉如何建立负压?