软件测试分为黑盒测试和白盒测试，其中(53)方法属于黑盒测试。

选配材料时，所选用混合材料要符合材质、（）及级配等要求。

KEY盒材质要求盒体四周（）

公共关系专题活动的基本要求包括（）

要求学生上网进行体育与健康专题探究时，教师应该怎样做？（）

Symmetric, or private-key, encryption is based on a secret key that is shared by both communcating parties. The （ ） party uses the secret key as part of the mathematical operation to encrypt （ ） text to cipher text. The receiving party uses the same secret key to decrypt the cipher text to plain text. Asymmetric, or public-key, encryption uses two different keys for each user: one is a （ ） key known only to this one user; the other is a corresponding public key, which is accessible to anyone. The private and public keys are mathematically related by the encryption algorithm. One key ia used for encyption and the other for decryption, depending on the nature of the communication service being implemented. In addition, public key encryption technoligies allow digital （ ） to be placed on messages. A digital signature uses the sender&39;s private key to encrypt some portion of the message. When the message is received, the receiver uses the sender&39;s （ ） key tp decipher the digital signature to verify the sender&39;s identity.

DPM 812 KEY箱KEY有无传感器属于（）

骨灰盒通常可以分为木质盒、石料盒等天然材料盒与陶瓷盒、塑料盒、树脂盒、金属盒等（）材料盒

结合实际，谈谈如何认识开展“两学一做”专题教育的实践要求。

利器盒整体颜色为黄色，在盒体侧面注明（）

机械密封结构中动静环材质硬度要求（）。

专题学习网站的类型：资源型的专题学习网站、（）、课堂互动型专题学习网站。