口对口人工呼吸法即使操作正确,吸入氧浓度也常低于()
A.21%
B.18%
C.15%
D.12%
E.10%
参考答案:B
设集合U={1,2,3,4},M={x|x2-5x+p=0},若CUM={2,3},则实数P的值为[ ]
A. -6
B. -4
C. 4
D. 6
()can be considered as part of risk mitigation.
A.Risk identification
B.Purchasing insurance
C.Assessment of outcomes
D.Assessment of probabilities