欲排除Graham-Steel杂音的可能，下列哪项最有价值
A．第一心音亢进B．左心室扩大C．奇脉D．血压正常E．心尖搏动向左移位
参考答案：B
Soon after the quakes, one thousand soldiers were sent out to ______ the miners from the local
coal mine. [ ]
A. shelter
B. rescue
C. bury
D. injure
对X线的描述，下列正确的是（）
A.X线的硬度大→频率高→穿透力强
B.X线的硬度大→波长长→穿透力强
C.X线的硬度大→频率高→穿透力弱
D.X线的硬度大→波长长→穿透力弱
E.X线的硬度大→HVL小→穿透力强
