临床麻醉中上呼吸道梗阻最常见的原因是()
A．舌后坠
B．分泌物过多
C．误吸
D．支气管痉挛
E．气管导管打折
参考答案：A
There _______ a sports meeting next week. [ ]
A. is going to have
B. is going to be
C. is going to has
D. going to be
某Web网站向CA申请了数字证书。用户登录该网站时，通过验证 (6) 来确认该数字证书的有效性，从而 (7) 。
A．CA的签名 B．网站的签名 C．会话密钥 D．DES密码
