水泥的性能指标不包括()。
A.细度
B.强度
C.硬度
D.水化热
参考答案:B
解析:
hey, Alice. You___ on the phone a moment ago. But you weren’t here and I took a message for you.
Oh? I was in the library.
A.are wanted
B.were wanted
C.are called
D.have called
质量是1.5kg的水,温度从80℃降低到30℃,求:水放出的热量是多少?[已知:水的比热容等于4.2×103J/(kg•℃)].