烃类有机物都能与氧气发生化学反应，而且反应要放出大量的热。( )
参考答案：对
Though_______ money, his parents managed to send him to university.
A．lacked
B．lacking of
C．lacking in
D．lacked in
搭焊法兰的连接密封形式是怎样的？有何特点和要求？
