管理结构和方式一般包括两个方面（）和（）。
参考答案：人、任务
Jim talked for about half an hour yesterday.Never＿＿＿＿＿ him talk so much.
A．I heard
B．did I hear
C．I had heard
D．had I heard
沿导、地线上悬挂的软、硬梯或飞车进入强电场的作业应遵守哪些安全规定？
