下述哪种病变不引起中枢性瘫痪()
A.脑外伤
B.脑血管意外
C.一氧化碳中毒
D.周期性瘫痪
E.脊髓外伤
参考答案:D
Betty is in China _____ her parents. [ ]
A. in
B. on
C. at
D. with
连铸工艺制度包括哪些方面?