往复泵的特性特别是理想工作过程的特性适用于（）的工作条件。
A.小流量、高扬程
B.小流量、低扬程
C.大流量、高扬程
D.大流量、低扬程
参考答案：A
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
根据罗西的观点，组成城市空间类型的要素是（）。
A.城市广场
B.城市街道
C.城市的平面
D.重要纪念物
E.城市柱廊
