运用B超探查动物肾区时,其肾盂部位声像图像为()
A.回声强而平滑
B.低强度均质微细回声
C.多个无回声暗区
D.放射状排列的强回声结构
E.点状回声区
参考答案:B
That day we ended up on the beach ________ aimlessly and the only sound was the waves ________ against the shore.
A.wandering; to beat
B.wandering; beating
C.to wander; beating
D.to wander; to beat
外照射防护的一般措施有()
A.时间防护
B.距离防护
C.屏蔽防护
D.以上都是
E.以上都不是