可用于治疗甲氧西林耐药的金黄色葡萄球菌引起的严重感染的是( )
A．克林霉素B．万古霉素C．克林霉素D．氨苄西林E．羧苄西林
参考答案：B
— How do you find air conditioners made by Haier Group Corporation?
— Of high quality. We ______ their products all these years. [ ]
A. sell
B. have sold
C. have been sold
D. have been selling
若梁的荷载及支承情况对称于梁的中央截面C，如图所示，则下列结论中哪一个是正确的？（）
A.Q图对称，M图对称，且Qc=0
B.Q图对称，M图反对称，且Mc=0
C.Q图反对称，M图对称，且Qc=0
D.Q图反对称，M图反对称，且Mc=0
