急性蜂窝织炎的主要致病菌是( )
A．金黄色葡萄球菌B．溶血性链球菌C．绿脓杆菌D．破伤风杆菌E．梭状芽孢杆菌
参考答案：B
出血疹多见于（）
A.麻疹
B.血清病
C.流行性出血热
D.风疹
E.水痘
Which signal is recognized as a distress signal?（）
A.Directing the beam of a searchlight at another vessel
B.A smoke signal giving off orange colored smoke
C.A whistle signal of one prolonged and three short blasts
D.International Code Signal "PAN" spoken over the radiotelephone
