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【单选题】
有关上消化道出血，下列不正确的是A.
上消化道大量出血一般指在数小时内失血量大于1000ml
B.
呕血提示胃内潴血量>250～300ml
C.
粪隐血试验阳性，失血量>5ml/d
D.
黑粪提示出血>50～75ml/d
E.
150ml/次可有急性失血表现
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举一反三
【单选题】In the background was that eternal hum.（ ）
A.
long
B.
never-ending
C.
boring
D.
extensive
【单选题】A continuous watertight bulkhead on a ship may also be a/an ().
A.
structural bulkhead
B.
exterior bulkhead
C.
centerline bulkhead
D.
joiner bulkhead
【单选题】The boys________the newspaper on the ground and began to read the news and articles in it. [ ]
A.
extended
B.
expanded
C.
stretched
D.
spread
【单选题】The word 'monopolize' in the last paragraph means ______.
A.
confine
B.
migrate
C.
control
D.
extend
【简答题】现有关系数据库如下: 数据库名:学生选课数据库 学生表(学号,姓名,性别,年龄,专业) 课程表(课程号,课程名,学分,先行课程号) 选课表(ID, 学号,课程号,分数) 检索有一门或一门以上课程成绩小于60分的所有学生的信息,包括学号、姓名
【单选题】What does the comment 'This is logical' mean?
A.
There is no clear way to determine the extent of our ancestor' s knowledge of plants.
B.
It is not surprising that early humans had a detailed knowledge of plants.
C.
It is reasonable to assume that our ancestors behaved very much like people in preindustrial societies.
D.
Human knowledge of plants is well organized and very detailed.
【单选题】The internal force of a material, which tends to resist deformation when subjected to external forces, is known as _____.
A.
stress
B.
strain
C.
shear strength
D.
ultimate tensile strength
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