建筑总平面图中的标高数值取至小数点后（）。
A、四位
B、三位
C、二位
D、一位
参考答案：C
Many families were broken up and their members were killed in the _______ caused by the earthquake inYaan.
A．chaos
B．chains
C．plains
D．masses
电网功率因数过低有什么不利影响？提高功率因数的办法有哪些？
