脊髓半切综合征最常见于()
A.脊髓空洞症
B.硬膜外病变
C.髓内病变
D.髓外硬膜内病变
E.脊髓炎
参考答案:D
—Good morning, I'm Jack Brown, your new teacher.
—Good morning, _ . [ ]
A. Mr Jack
B. Mr Brown
C. Teacher Jack
D. Teacher Brown
常压精馏塔回流温度()℃。
A、54~56
B、58~60
C、61~62
D、58~64.5