Initial stability is indicated by().
A.GM
B.KM
C.Deck load
D.Maximum allowed KG
参考答案:A
药品经营企业对进货情况()
A.1500M2
B.1000M2
C.500M2
D.150M2
E.50M2
在平面直角坐标系中,A(2,0),B(1,2),A1(0,-4),B1(4,-2),则△AOB与△A1OB1的关系是______(相似或不相似).