本身无药理活性,在生物体内转化为活性的药物是()
A.前药
B.生物电子等排
C.代谢拮抗
D.硬药
E.软药
参考答案:A
膨胀土路堑施工,当砌筑不能紧跟开挖时,开挖的边坡应暂留厚度不小于()的保护层。
A.0.3m
B.0.4m
C.0.5m
D.0.8m
It was hard for him to fit in a new class, in which ______ he was familiar with.
A.each
B.neither
C.both
D.none