CT检查对其帮助较大的疾病是（）
A.胆囊结石
B.胃肠道穿孔
C.泌尿系结石
D.肝内占位
E.麻痹性肠梗阻
参考答案：D
—Why don't you spend much time on your study? You are really ______ me down.
—Sorry, morn, I won't do that again. [ ]
A. put
B. take
C. let
D. make
DF4B型内燃机车燃油箱容量为（）L。
