在《精神障碍诊断和统计手册》第四版中，心理障碍被划分为（）类。
A．15
B．16
C．17
D．18
参考答案：C
In a review of 44 studies, American researchers found that men and women who ate six key foods
daily cut the_____ of heart disease by 76% . [ ]
A. trouble
B. problem
C. risk
D. secret
电气二次设备是什么？
