热介质炉的除气－缓冲罐都起哪些作用？
参考答案：
除去系统中的气体和挥发性轻组分，保证进入炉体的热介质油不含气体和水分。
A student in our school will be immediately sent home if he is found __________ computer games at night.
A．play
B．playing
C．to play
D．played
下列哪项不是血红蛋白肽链结构()
A．HbA-αβ
B．HbA-α2β2
C．HbA2-α2δ2
D．HbF-α2γ2
E．HbBarts-γ4
