发生压疮的最主要原因是()。
A.局部组织受压过久
B.病原微生物侵入皮肤
C.机体营养不良
D.用夹板时衬垫不平
E.皮肤受潮湿、摩擦刺激
参考答案:A
内源性凝血系统最常用的筛选试验是()
A.APTT
B.复钙时间
C.CT
D.ACT
E.BT
It was clear that the small grocer was _____ people he owed money to.
A.at the expense of
B.at the risk of
C.in the way of
D.at the mercy of