共赢共好的局面用《易经》的话说就是（）
A.群龙无首
B.亢龙有悔
C.六龙御天
D.上善若水
参考答案：A
A continuous sounding of a fog-signal apparatus indicates（）.
A.the vessel is in distress
B.the vessel has completed loading dangerous cargo
C.it is safe to pass
D.the vessel is anchored
简述铸造金属全冠适应证。
