已知r=1，则一定有（）。 A.a=0 B.Sy=0 C.Syx=0 D.b=1 E

In English, family name comes ______.[ ]

A. first

B. last

C. in

D. middle

英国历史学家汤因比曾经把中 * * 长期形成的（），看成是对未来世界产生重要影响的历史遗产。

A.中国精神

B.中国文化

C.世界精神

D.世界文化

(71) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (72) for designing and constructing an improved system. (73) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (74) . (75) is another such technique that integrates data and process concerns into constructs called objects.

（74）是（）

A.PERT

B.DFD

C.ERD

D.UML

腊主权债务危机的主要影响包括（）

A.增大希腊融资成本

B.恶化希腊旅游收入

C.拖累欧元下滑

D.影响高盛公司声誉