如果a=b,那么a+c=b+______
如果a=b,那么a-c=b-______.
如果a=b,那么a+c=b+c,
如果a=b,那么a-c=b-c.
故答案为:c,c.
毫针的选择应注意()
A.长短粗细规格适合病情
B.针身光滑坚韧而有弹性
C.针尖圆利无钩
D.针根不松动
E.针柄无松动
()is one of functions in logistics, which can deliver goods to customer directly by order in the most economic way.
A.Transportation
B.Distribution
C.Sending goods
D.Carrying goods