冷轧钢板工序热处理存在的事故危险是()。
A.爆炸
B.中毒
C.掉卷
D.倒炉
参考答案:B, C, D
It is the first time that I ______ this kind of moon cake.
A.enjoyed
B.have enjoyed
C.had enjoyed
D.enjoy
骨折在愈合过程中断骨间牢固结合,并能支撑和负重是在()阶段。
A、骨痂改建期
B、骨性骨痂期
C、纤维骨痂期
D、血肿期