临床上可作为戒毒药品的（）。
A．盐酸丁丙诺啡
B．盐酸纳洛酮
C．酒石酸布托啡诺
D．盐酸关沙酮
E．盐酸哌替啶
参考答案：D
Workaround is______．
A．a response to a negative risk that has occurreA workaround is not planned in advance of the occurrence of the risk event
B．a contingency plan
C．implementation of the contingency plan for a positive risk event
D．using global sourcing to continue project development around the clock
风速与地面粗糙度有关，粗糙度越大，风的阻力越大，风速越小。密集建筑群且房屋较高的城市市区地面粗糙度为（）。
A.A类
B.B类
C.C类
D.D类
