螺栓穿入方向要求，垂直地面者由（）穿入。
A.左向右
B.右向左
C.上向下
D.下向上
参考答案：D
—I don’t think you saw him just now.
—_____. I did see him yesterday.
A．Really
B．Generally
C．Actually
D．Greatly
淤胆型肝炎患者血红素明显升高，以非结合胆红素为主
