临床上在灌注石膏模型后多久可利用模型制作修复体
A．2hB．4hC．12hD．24hE．48h
参考答案：D
Hank is always rude, ______ is why people tend to avoid him. [ ]
A. that
B. it
C. this
D. which
炉衬蚀损的原因是什么？
