超声的纵向分辨率是分辨前后两个点最小距离的能力,其理论计算值应是
A.1/4λ(λ波长)B.1/3λC.1/2λD.1AE.2>1λ
参考答案:C
—What do you think of the furniture on sale?
—Pretty good. But ____________ what you bought with the samples, I don’t think it is __________ the money.
A.comparing; worth
B.compared; worthwhile
C.compare; worthy
D.comparing; value
穿刺损伤性出血与蛛网膜下隙出血的脑脊液主要区别在于()
A.外观
B.透明度
C.细胞计数
D.生化检测
E.离心观察上清液颜色及红细胞形态