单层螺旋CT与非螺旋CT相比,不同的是()
A.纵向分辨率有所下降
B.横向分辨率有所下降
C.高对比分辨率上升
D.密度分辨率下降
E.空间分辨率保持不变
参考答案:A
.
It was ______ the 19th century_____ heat was considered to be a form of energy.
A.not until; that
B.until; that
C.not until; when
D.until; when
换药室要求空气中的细菌总数()
A.≤10cfu/m3
B.≤100cfu/m3
C.≤200cfu/m3
D.≤500cfu/m3
E.≥500cfu/m3