如图,点D是AABC的边AB上的中点,则向量()
A.A
B.B
C.C
D.D
参考答案:A
解析:
[*],故选A。
Which category of tests assumes that, in an efficient market, securities lie on the security market line()
A. Event studies.
B. Cross-sectional tests.
C. Time-series tests.
何谓层流和紊流?如何具体判别其流态?