油基钻井液的分散介质是（）。
A.水
B.油
C.化学药剂
D.粘土
参考答案：B
自我介绍时应注意哪些礼仪？
Which of the following options is NOT one of the Key Objectives of NSN Smart Labs?（）
A.Should benefit all involved companies.
B.Attract public interest.
C.Invite Competition.
D.Open for all developers and all operators.
