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【简答题】
I was c__________ (完全) tired after a threeday trip.
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【单选题】The hostess attempted to __________ a romantic atmosphere in her 10th marriage anniversary.
A.
strive
B.
contrive
C.
conceive
D.
retrieve
【简答题】3-29 .已知线性回归模型 ,n=13 且k=3 (n 为样本容量,k 为参数的个数),由二次型 的最小化得到如下线性方程组: 要求:( 1 )把问题写成矩阵向量的形式;用求逆矩阵的方法求解之; ( 2 )如果 ; ( 3 )求出 的方差 —协方差矩阵。
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, _____ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons .
A.
gases
B.
elements
C.
air
D.
molecules
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, ______ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons.
A.
substances
B.
elements
C.
gases
D.
air
【简答题】Read the following passage and translate it into Chinese. The nitrogen cycle consists of a sequence of biochemical changes wherein nitrogen is used by living organisms, transformed upon death and deco...
【简答题】某企业生产A产品，本月成本资料如下： 摘要 直接材料 直接人工 制造费用 合计 月初在产品成本 2000 2000 本月发生费用 7000 1000 2000 10000 本月生产费用合计 9000 1000 2000 12000 A产品本月完工800件，月末在产品200件。 要求：假定原材料于生产开始时一次投入，采用在产品按所耗直接材料费用计价法计算完工产品和在产品成本。
【单选题】With the efforts to analyze the atmosphere in the 17th and 18th century, _____ such as hydrogen were discovered which in turn led to the invention of hydrogen balloons .
A.
gases
B.
elements
C.
air
D.
substances
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