操作塔式起重机严禁下列哪些行为？（）
A.拔桩
B.斜拉、斜吊
C.顶升时回转
D.抬吊同一重物
E.吊物上站人
参考答案：A, B, C, E
Jimmy needs to improve his technique if he _____ gold at 2012 Olympic. [ ]
A. wins
B. is winning
C. will win
D. is to win
哪项是佝偻病时骨样组织堆积的表现（）
A.肋缘外翻
B.O形腿
C.手镯征
D.颅骨用手压有乒乓球的感觉
E.肋膈沟
