锅炉三大安全附件不正确的有（）
A、安全阀
B、温度计
C、压力计
D、水位计
参考答案：B
He was educated at Beijing University,____ she went on to have her advanced study abroad.[ ]
A. after which
B. from which
C. from that
D. after that
同一系统上的压力表读数不一致时，应以较高的读数为准。（）
