办理旅客乘降的车站和乘降所，应设置硬面化站台，车站站台的长度，一般应为（）米。
A.650
B.600
C.550
D.400
参考答案：C
肠蠕动音为金属样可见于（）。
A.低血钾
B.急性肠炎
C.麻痹性肠梗阻
D.机械性肠梗阻
E.败血症
The meeting achieved _____ a short statement, leaving many details to be worked out later. [ ]
A. other than
B. anything but
C. little more than
D. more or less
