Of the two types of sentence stress, sense stress shows contrast, while logical stress shows meaning.（）
行政管理的运行职能有（） ["决策","执行","协调","监督"]
计算机信息系统的安全包括实体安全、软件安全、数据安全和（）
（）密码体制的加密密钥和解密密钥相同。 ["序列","分组","对称","公开"]
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
在设备安装时将地脚螺栓放入预留孔内，再灌入混凝土或水泥砂浆，使地脚螺栓固定，这种方法称为（）
