下列井控装备,()是井控专用设备及工具。
A、节流管汇
B、清理障碍物专用工具
C、旋转控制头
D、强行起下钻装置
E、灭火设备
参考答案:B, C, D, E
关于MBL途径正确的是()。
A.是最早被发现的补体激活途径
B.活化过程需要B因子参与
C.需要抗原抗体复合物的参与
D.形成的膜攻击复合物同经典途径相同
E.不形成经典途径的C5转化酶
I kept looking at the man wearing a pair of glasses, wondering ________.
A.whether did I borrow his book
B.where I had seen him before
C.what I knew his wife
D.when had I helped him