锅炉保护过热器的办法是点火初期控制（），随着过热器内蒸汽流通量增大，使管壁逐渐得到良好的冷却，这时要控制过热器（）。
参考答案：烟气温度、出口汽温
诊断成人腰椎结核最可靠的依据是
A．低热、盗汗、乏力和食欲缺乏B．结核菌素试验阳性C．腰痛、拾物试验阳性D．X线片示椎间隙狭窄，椎体边缘模糊
Speaker A: Excuse me, could you tell me how to get to the railway stationSpeaker B: ______
A．Yes, of course I can.
B．Well, you'd better not ask a stranger.
C．Sorry. I'm a stranger here myself.
D．Yes, you can take a taxi. It's more expensive, but it's quicker.
