强制对流空气冷却式冷凝器,为了有效利用传热面积,保证焊接工艺要求,沿空气流动方向的管排数一般为()。
A.4-7
B.3-6
C.1-4
D.2-5
参考答案:C
Dr. Smith, as well as his wife and daughters , ______ visit Beijing this summer.
A is going to B are going to C was going to D were going to
行政处罚的听证由()主持。
A.听证书记员
B.委托代理人
C.非本案件调查人员
D.听证纪录人