天线的增益系数是()和方向性函数的乘积。
A.辐射功率
B.辐射阻抗
C.方向图
D.天线效率
参考答案:D
The housing problems we are looking forward to seeing _____ have attracted the government’s attention.
A.solving
B.solve
C. solved
D.to solve
下列哪项是监测口服香豆素类抗凝药物最佳指标()
A.PT
B.微电泳法
C.F1+2测定
D.加钙凝血酶法
E.发色底物法