解除舌后坠的方法,哪项除外()
A.偏头
B.垫枕抬头
C.托下颌
D.提颏
E.放置口咽通气道
参考答案:B
下列属于缺货成本的是( )。
A.存货残损霉变损失B.储存存货发生的仓储费用C.存货的保险费用D.产品供应中断导致延误发货的信誉损失
"Thanks" is a(n) _______ commonly used to express one's gratitude to someone for something he
has done for you.[ ]
A. word
B. idiom
C. expression
D. phrase