党的十六大强调，“发展社会主义民主政治，最根本的是要把坚持（）、人民当家作主和依法治国有机统一起来”。

A.社会主义制度

B.政治体制改革

C.党的领导

At the instant when a string of casing being run from a ship is landed in the well head,（）.

A.the total weight in air of the casing string is removed from the ship

B.the hook load (weight of the casing string) is removed from the ship

C.the weight of the casing inside the riser is removed from the ship

D.the weight of the casing string added to the weight of the fill-up mud is removed from the ship