木材和草类的纤维细胞中、最长的纤维细胞为:().
参考答案:管胞
—Shall I open the window to let some fresh air in?.
—No, ______.
A.I'd rather not
B.I'd rather you not
C.I'd rather you didn't
D.I'd like not to
手术进行中术者应遵守的无菌原则().
A.手套有破损应立即更换
B.下坠超过手术台边以下的器械不能用
C.接触有腔脏器的器械与物品,不可再用于无菌部位操作
D.手套接触有菌区后,应酒精消毒
E.切开污染脏器前,用纱垫保护周围组织