纠正投资偏差的措施分为( )。
A．组织措施
B．经济措施
C．技术措施
D．合同措施
E．质量措施
参考答案：A,B,C,E
It is advised by health experts that windows should be opened now and then for air to _____, which
makes the air in your room fresher. [ ]
A. go though
B. get through
C. circulate
D. spread around
在对称的三相正弦交流系统中，中线电流为（）。
