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【单选题】
1990年8月，某远洋客轮上发生一起军团病暴发流行。船离开港口时载有350名乘客、50名船员。8月1日前的一内，在一次风暴中有1/7的乘客遇难。8月份第一中，船上有30人发生军团病，其中一半很快死亡。随后的一内又有20人发病，但无死亡。假设症状持续一个月。8月1日至14日，军团病的累积发病率是（以8月1日凌晨零点零1分时船上人口作为危险人群）（）
A.
0.100
B.
0.125
C.
0.143
D.
用该资料不能计算
E.
以上答案均不是
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【单选题】数据库概念设计的E-R方法中，用属性描述实体的特征，属性在E-R图中，一般使用如下所列的表示。
A.
矩形
B.
四边形
C.
菱形
D.
椭圆形
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【单选题】Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists cre-ate too much traffic,...
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It is extremely important to develop tourism.
B.
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C.
Support facilities are highly necessary.
D.
Planning is of great importance to tourism.
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【单选题】Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places' that are also enjoyed by the inhabitants of a country. If tourists create too much traffic,...
A.
It is extremely important to develop tourism
B.
Building roads and hotels are essential
C.
Support facilities are highly necessary
D.
Planning is of great importance to tourism
查看完整题目与答案
【判断题】为了减弱垂直轴倾斜误差的影响,观测过程中应保持照准部水准器气泡居中。当使用J1型和J2型经纬仪时,若气泡偏离水准器中央一格时,应立即重新整平仪器并重测本测回。
A.
正确
B.
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【单选题】Without proper planning, tourism can cause problems. For example, too many tourists can(面性)crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffi...
A.
It is extremely important to develop tourism.
B.
Building roads and hotels is essential. (必不可少的)
C.
Support facilities are highly necessary.
D.
Planning is of great importance to tourism.
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【单选题】一个样本中所包含的个体数目是多少是指( )。
A.
样本
B.
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C.
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D.
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【简答题】为了减弱垂直轴倾斜误差的影响,观测过程中应保持照准部水准器气泡居中。当使用J1型和J2型经纬仪进行精密角度测量时,若气泡偏离水准器中央一格时,应立即重新整平仪器并重测 。
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【单选题】当今在英美哲学中最大的唯名论者是美国哲学家( )。
A.
马斯洛
B.
罗素
C.
蒯因
D.
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【单选题】The Planning Office had decided to close the school because ______.
A.
there were too many children in each class
B.
the schools in Raval were bigger and better
C.
it had too few children and it was expensive to run
D.
the teacher was retiring and they could not find another
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【单选题】数据库概念设计的E-R方法中，用属性描述实体的特征，属性在E-R图中，一般使用如下所列的表示。
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【单选题】Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists cre-ate too much traffic,...
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【单选题】Without proper planning, tourism can cause problems. For example, too many tourists can crowd public places' that are also enjoyed by the inhabitants of a country. If tourists create too much traffic,...
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【判断题】为了减弱垂直轴倾斜误差的影响,观测过程中应保持照准部水准器气泡居中。当使用J1型和J2型经纬仪时,若气泡偏离水准器中央一格时,应立即重新整平仪器并重测本测回。
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【单选题】Without proper planning, tourism can cause problems. For example, too many tourists can(面性)crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffi...
A.
It is extremely important to develop tourism.
B.
Building roads and hotels is essential. (必不可少的)
C.
Support facilities are highly necessary.
D.
Planning is of great importance to tourism.
查看完整题目与答案
【单选题】一个样本中所包含的个体数目是多少是指( )。
A.
样本
B.
总体
C.
样本容量
D.
抽样
查看完整题目与答案
【简答题】为了减弱垂直轴倾斜误差的影响,观测过程中应保持照准部水准器气泡居中。当使用J1型和J2型经纬仪进行精密角度测量时,若气泡偏离水准器中央一格时,应立即重新整平仪器并重测 。
查看完整题目与答案
【单选题】当今在英美哲学中最大的唯名论者是美国哲学家( )。
A.
马斯洛
B.
罗素
C.
蒯因
D.
齐泽克
查看完整题目与答案
【单选题】The Planning Office had decided to close the school because ______.
A.
there were too many children in each class
B.
the schools in Raval were bigger and better
C.
it had too few children and it was expensive to run
D.
the teacher was retiring and they could not find another
查看完整题目与答案