冻结性冻伤的致伤原因是()
A.0~10℃的低温
B.0℃以下的低温
C.-10℃以下的低温
D.0~10℃的低温和潮湿
E.0℃以下的低温和潮湿
参考答案:B
Mary never does any reading in the evening, _____. [ ]
A. so does John
B. John does too
C. John doesn't too
D. nor does John
预拌混凝土有哪些质量要求?