正常肺泡呼吸音的最明显听诊部位在
A．喉部B．肩胛下部C．胸骨角附近D．右肺尖E．肩胛上部
参考答案：B
The machine ____. It has worked for years. [ ]
A. didn't work
B. wasn't working
C. doesn't work
D. isn't working
当混凝土拌合物流动性偏小时，调整时应增加（）。
A、水泥
B、水
C、水泥和水
D、砂和石子
