接地体宜采用铝导体、角钢、钢管或光面圆钢、螺纹钢等。
参考答案：错
---May I take your order now?
---_______.
A．No,I'm in trouble now
B．Yes, we obey orders
C．Yes, I'd like a dish of chicken
D．No, I don't have a choice of meat
最可能的诊断是
A．感染性肺炎
B．羊水吸入综合征
C．湿肺
D．肺透明膜病
E．持续肺动脉高压
