胃大部切除术后并发症中,哪项切忌再次手术
A.胃肠吻合口破裂
B.急性完全性输入段梗阻
C.胃吻合口排空障碍
D.十二指肠残端破裂
E.输出段梗阻
参考答案:C
—How many students are there in your school?
—_______ he students in our school _______ over two thousand. [ ]
A. The number of, is
B. The number of, are
C. A number of, is
曲轴正时齿轮与凸轮轴正时齿轮可任意装配。