甲袋有a千克大米,乙袋有b千克大米。如果从甲袋倒出5千克大米装入乙袋,那么两袋的大米同样重。下面不符合题意的式子是[ ]
A.a-5=b+5
B.a-b=5
C.a-b=5×2
答案:B
药材款冬花的性状鉴别特征是()
A.苞片外表面密被灰白色或灰绿色有光泽的长茸毛
B.表面黄白色或绿白色,密被短柔毛
C.苞片内表面密被白色绵毛,撕开可见白色丝状绵毛
D.断面皮部有黄白色至黄棕色絮状纤维
E.表面黄白色或绿白色,密被红色星状毛
When should the emergency position-indicating radio beacon be activated after abandoning an OSV?()
A.Immediately
B.After one hour
C.Only when another vessel is in sight
D.Only after sunset