下列哪项并发症是胃大部切除术后病人死亡的主要原因()。
A.术后出血
B.十二指肠残端破裂
C.胃肠吻合口破裂
D.倾倒综合征
E.胆汁反流性胃炎
参考答案:B
如图所示是某电场中的一条电场线,一电子从a点由静止释放,它将沿电场线向b点运动,下列有关该电场情况的判断正确的是
A.该电场一定是匀强电场
B.场强Ea一定小于Eb
C.电子具有的电势能Epa一定大于Epb
D.电势φa>φb
Which of the following random variables would be most likely to follow a discrete uniform distribution()
A. The outcome of the roll of two standard, six - sided dice where X is the sum of the numbers facing up.
B. The number of heads on the flip of two coins.
C. The outcome of a roll of a standard, six - sided die where X equals the number facing up on the die.