立式钻床有渗漏油现象，可能是结合面不够平直或油管接头结合面配合不良。
参考答案：对
After he became conscious, he remembered _________ and _________ on the head with a rod.
A．to attack; hit
B．to be attacked; to be hit
C．attacking; be hit
D．having been attacked; hit
界址线
