为了保证汽轮机设备安全运行，汽轮机装有哪些保护装置？
参考答案：
汽轮机装有超速保护、轴向位移（串轴）保护、低油压保护、低真空保护等装置。
So clearly ______ that I was able to understand much of what he said. [ ]
A. did he say
B. he told
C. did he speak
D. he talked
《诗经》内容丰富广阔，主要有（）
A.社会政治诗
B.情爱诗
C.史诗
D.写景诗
E.农事诗
