女性,32岁,入冬以来中上腹不适,并阵发性隐痛,有空腹痛及夜间痛,近2天大便发黑。其可能的诊断是
A. 急性胃粘膜病变出血
B. 胃溃疡伴出血
C. 十二指肠溃疡伴出血
D. 空肠憩室炎伴出血
E. 胃癌伴出血
He didn't go to school ______ he is ill.
A. when
B. as
C. while
预应力筋张拉锚固后实际预应力值的偏差不得大于或小于工程设计规定检验值的( )。
A. 20%
B. 15%
C. 10%
D. 5%
He died and ______ nothing.
A. leave
B. leaves
C. left