3.1 Preface 1. data object--- a set of instances or values for example: Boolean={ false,true} Digit={0,1,2,3,4,5,6,7,8,9} Letter={A, B, ....., a,b, ..... Z} NaturalNumber= {0, 1,2, ..... Integer={0,+1,-1,+2,-2,+3,-3,} String={a,, ..... ,aa, ab, ac
AA 制 Dutch treatment; go Dutch B to B (B2B) business to business B to C (B2C) business to consumer NASDAQ National Association of Securities Deal Automated Quotations 艾滋病(获得性免疫缺陷综合征) AIDS (Acquired Immune Deficiency Syndrome)
Bone marrow hematopoiesis failure led by chemicals, radiation, biological factors and unknown etiology. The common clinical presentation is mild to severe pancytopenia