扬压力
DJ6型光学经纬仪的安置工作包括（）和（）。
When you connect an external monitor to your portable computer, the same image appears on both monitors. You need to drag a window from one monitor to the other. What should you do?（） ["A","B","C","D"]
按调节周期长短分，兴利调节可分为（）调节、（）调节、（）调节、（）调节和（）调节。
混凝土强度等级是用边长（）的立方体试块确定的。 ["50m","l00m","150mm","75mm"]
胎盘
