硫磺装置反应炉空气流量低于（），造成硫磺装置克劳斯联锁。
A、1.0t/h
B、1.5t/h
C、1.8t/h
D、2.0t/h
参考答案：C
They have a good knowledge of English but little they know about German. [ ]
A. have
B. did
C. had
D. do
基圆相同，渐开线形状相同，基圆越大，渐开线越弯曲。
