小小解说员（解释下列词语）。

(1)相依为命：                                                                                                                                  

(2)欣欣向荣：                                                                                                                                  

(3)郑重其事：                                                                                                                                  

(4)束手无策：                                                                                                                                  

(5)垂头丧气：                                                                                                                                  

(6)胸有成竹：                                                                                                                                 

国家卫生计生委《戊二醛类消毒剂卫生质量技术规范》中规定了戊二醛类消毒剂的使用范围，不属于其中之一的是（）

A.主要用于医疗器械的浸泡消毒与灭菌

B.不得用于注射针头、手术缝合线及棉线类物品的消毒或灭菌

C.不得用于室内物体表面的擦拭或喷雾消毒

D.不得用于手、皮肤黏膜消毒

E.可用于室内空气消毒