举升机举升车辆后，应用（）来承受车辆载荷。
A.液压自锁
B.安全钩锁紧
C.液压自锁和安全钩锁紧共同作用
参考答案：B
John opened the door. There _____ he had never seen before. [ ]
A. a girl did stand
B. a girl stood
C. did a girl stand
D. stood a girl
Horner征不会见于（）
A.大脑皮质
B.中枢交感神经通路受损
C.脑桥病变
D.延髓背外侧综合征
E.脊髓C8～T1侧角病变
