轮状病毒感染后主要侵犯（）
A.十二指肠
B.回肠
C.升结肠
D.空肠
E.乙状结肠
参考答案：D
But for his help, we wouldn't have succeeded. So we ______ his timely aid. [ ]
A. distributed
B. contributed
C. acknowledged
D. admitted
集中性漏电的寻找方法是什么？
