儿童溃疡性结肠炎最严重的并发症为（）
A.结肠出血
B.结肠狭窄
C.中毒性巨结肠
D.结肠肉芽肿
E.结肠癌
参考答案：C
-Why would some workers in Foxconn die ________ continue working in the factory?
-Psychologists say they are under too much pressure.[ ]
A. better than
B. by accident
C. instead of
D. rather than
根据国家标准，变压器上有几个油位标志？
