含盐量的高低决定了钻井液的（）性能。
A、造壁
B、切力
C、导电
D、粘度
参考答案：C
（）are the_ four major activities of software configuration management. ①configuration identification ②statement report ③change control ④preparation of requirement document ⑤configuration auditing
A.①②③④
B.①②④⑤
C.①②③⑤
D.②③④⑤
