进行水力模型实验，要实现明渠水流的动力相似，应选的相似准则是（）。
A.雷诺准则
B.弗劳德准则
C.欧拉准则
D.其他准则
参考答案：B
按正确的顺序排列下列句子。
A. The second day, we went to the Palace Museum.
B. Did you go shopping?
C. The first day, we went to Tian'anmen Square.
D. What did you do?
E. Yes! The third day, we went to Wangfujing.
F. What else did you do?
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糖尿病患者运动宜选择的时间为（）
A.在外援性胰岛素作用高峰时期
B.餐后1—1.5小时
C.空腹
D.餐前1—1.5小时
