氧化镁晶胞中含有()个分子。
A.2
B.3
C.4
D.6
参考答案:C
There is no doubt at all________she will call us when she gets there. [ ]
A. if
B. whether
C. what
D. that
乙状结肠癌最早出现的临床表现是()
A.腹部隐痛
B.大便习惯改变
C.恶心呕吐
D.腹内肿块
E.消瘦、贫血