巴豆苷是（）
A.O苷
B.N苷
C.S苷
D.C苷
E.酚苷
参考答案：B
Which is a distress signal? （）
A.A triangular flag above or below a ball
B.The International Code Signal of distress indicated by "JV"
C.A green smoke signal
D.Flames on the vessel as from a burning tar barrel
解散分立
