题目内容

对于水基压裂液，比较常用的且形成工业化的交联剂为硼砂、有机钛、锆、（）等。

A. 有机镁
B. 有机硼
C. 氯化钾
D. 氯化钠

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Which of the following options lists the steps in PPP session establishment in the correct order?（）

A. Optional authentication phase, link establishment phase, network layer protocol phase.
B. Network layer protocol phase, link establishment phase, optional authentication phase.
C. Network layer protocol phase, optional authentication phase, link establishment phase.
D. Link establishment phase, network layer protocol phase, optional authentication phase.
E. Link establishment phase, optional authentication phase, network layer protocol phase.
F. Optional authentication phase, network layer protocol phase, link establishment phase.

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