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【单选题】
再保险的保险标的是指( )根据原保险合同所承担的契约责任A.
原保险人
B.
投保人
C.
再保险人
D.
收益人
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【简答题】某企业2009年计划比上年增产甲产品10%,乙产品8%,丙产品5%;实际产量甲产品为上年1.2倍,以产品为上年85%,丙产品为上年2.03倍。试确定三种产品计划完成程度指标。
【简答题】在用光学平直仪和精密水平仪测量机床导轨的直线性误差时，可用（）法或（）法求得误差值。
【单选题】What can we assume about photographers in the 1800s?
A.
Most of them had originally been painters before they became interested in photography.
B.
Portrait photographers were in the highest demand since people wanted images of their families.
C.
There were only a few photographers who were willing to work in such a new profession.
D.
Some of them must have experienced health problems as a result of their laboratory work.
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