在GRE脉冲序列中,翻转角(小于90°角)越小所获图像越接近于()
A.T1加权像
B.T2加权像
C.质子密度加权像
D.以上均是
E.以上均不是
参考答案:B
A portfolio is equally invested in Stock A, with an expected return of 6 percent, and Stock B, with an expected return of 10 percent, and a risk-free asset with a return of 5 percent. The expected return on the portfolio is:()
A. 7.4%.
B. 8.0%.
C. 7.0%.
具有化瘀开窍、清热解毒功效的药物是()。
A.钩藤
B.金银花
C.牛黄
D.菊花
E.大青叶