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【单选题】
男性，45岁。既往有肝炎病史15年。厌食、乏力、腹胀2个月，5小时前突然呕出大量鲜血3次，共约1200ml，含有凝血块。查体：P112次/分；BP80/50mmHg；巩膜轻度，肝后肋下4cm，质硬，结节状；左上腹扪及肿物，肋下3cm，边缘圆钝，质地中等，未触及结节，上界不清；腹腔积液征阳性。化验：Hb5.6g/L，WBC3.0×10 9 /L，HBsAg（+）。该患者出血的最可能原因是（）。A.
溃疡
B.
肝癌并胆道出血
C.
胃癌出血
D.
胆道结石并胆道出血
E.
食管胃底静脉曲张破裂出血
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【单选题】How long do you think it will be _______ scientists succeed in providing a cure for cancer?
A.
when
B.
after
C.
since
D.
before
【单选题】以下关于锉削方法叙述不正确的是()。
A.
锉刀断面形状的选择要和工件加工部位形状相适应
B.
锉平平直的平面，必须使锉刀保持直线的锉削运动
C.
为了提高效率，前推和返回都施加压力进行锉削
D.
锉削的表面不能用手去摸
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A.
not be able to
B.
except
C.
harder
D.
do
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A.
As far as
B.
In case
C.
Even if
D.
So long as
【简答题】锉削时两手的用力和锉削速度: 要锉出平直平面,必须使锉刀保持直线运动。锉削时右手的压力要随锉刀推动而 ,左手的压力要随锉刀推动而逐渐减小,回程 ,以减小锉齿的磨损。 速度:一般应在 次/分左右,推出时稍慢,回程稍快,动作自然协调。
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A.
too much of us
B.
us too much
C.
of us too much
D.
us of too much
【简答题】阅读下来短语,选择匹配的答案。
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