在乙肝病毒标记中对人体有保护作用的是()
A.抗HBS
B.抗HBc
C.DNA-D
D.Dane颗粒
E.抗HBe
参考答案:A
由3y+5x+2=0可得用x表示y的式子是y=______.
Close procurements is a process that involves
A) customer satisfaction analysis and final paymentB) administrative closure and archiving recordsC) final contractor payment and lessons learnedD) product verification and administrative closure