埋置检波器要求中的“紧”的内容是指（）。
A、检波器的尾椎要拧紧
B、检波器的外壳要拧紧
C、检波器与地面耦合要紧
D、检波器串与电缆连接要紧
参考答案：C
— Call me at 9:00. I can't afford to miss such an important meeting.
— Don't worry, sir. You will surely be __________. [ ]
A. reminded
B. warned
C. replaced
D. forgiven
柴可夫斯基的三大舞剧
