男性,70岁。腹胀,腹痛,恶心,呕吐,无排便、排气2天;查体:腹胀不均匀,以左下腹明显,可见肠型,左下腹有明显压痛,应首先考虑的诊断是
A. 肠套叠
B. 粘连性肠梗阻
C. 嵌顿疝
D. 麻痹性肠梗阻
E. 肠扭转
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男性,40岁。呕血、黑粪2天;晕厥一次,患者面色苍白,四肢湿冷,心率110次/分,血压90/60mmHg,小便少,估计失血量是
A. 400ml
B. 500ml
C. 600ml
D. 700ml
E. 800ml
I am still unable to make myself ______ in the discussion, which worries me a lot.
A) to be understood
B) understanding
C) understood
D) understand
I thought you ______ like something to read, so I have brought you some books.
A) may
B) might
C) could
D) must
根据《发票管理办法》的规定,纳税人已开具的发票存根联和发票登记簿的保存期限是( )。
A. 3年
B. 5年
C. 10年
D. 15年