在逻辑框架水平逻辑层次的内容中，对应验证指标的是( )。
A．验证类型
B．咨询信息
C．验证手段
D．验证结果
参考答案：C
The Diaoyu Islands _____ in Chinese maps since the 14th and 15th centuries.
A．have been included
B．had been included
C．were included
D．are included
梅毒的病原体是（）
A.幽门螺旋菌
B.苍白螺旋体
C.沙眼衣原体
D.解脲支原体
E.生殖支原体
