伤寒病程中任何时期阳性率最高的是()
A.血培养
B.骨髓培养
C.便、尿培养
D.血、便、尿培养
E.玫瑰疹培养
参考答案:B
Weather __________,the sports meet will be held as scheduled. [ ]
A.permits
B.will permit
C.to permit
D.permitting
下列物质分子的电子式正确的是 [ ]
A.CH3Cl
B.羟基
C.CO2
D.C2H4