洗涤塔T1301的内件主要有哪些？
参考答案：
洗涤塔T1301的内件主要有下降管、上升管、升气罩、四块冲击式塔板、降液管和折流式除雾器。
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
可以作回旋（内旋、外旋）运动的关节有（）
A.颈椎关节
B.肩关节
C.髋关节
D.桡尺近侧、远侧关节
E.腰椎关节链
