加压式长筒取心工具的接单根专用装置是（）接头。
A.加压
B.悬挂
C.滑动
D.配合
参考答案：C
I am in _______charge of the class which was in __________charge of my wife.
A．不填；the
B．不填；不填
C．the; 不填
D．the; the
铁碳相图中发生共晶转变的温度是（）℃。
A、1495
B、727
C、1148
D、510
