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【多选题】
设x1,X2,.....,Xn是来自正态总体N(μ, 1)的一个样本,下列属于μ的无偏估计量的是A.
1/3X1+2/3X2
B.
1/4X1+3/4X2
C.
1/2X1+1/2X3
D.
1/2X1+1/3X2
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【单选题】弯曲试验时应测量试样中部的宽度和厚度，并且（ ）。
A.
宽度精确到0.1mm，厚度精确到0.1mm
B.
宽度精确到0.01mm，厚度精确到0.01mm
C.
宽度精确到0.01mm，厚度精确到0.1mm
D.
宽度精确到0.1mm，厚度精确到0.01mm
【简答题】夏衍编剧的影片《春蚕》是根据________的同名小说改编的。
【单选题】李先生,46岁,患十二指肠球部溃疡5年,近日原疼痛节律消失,变为持续上腹痛,伴频繁呕吐隔夜酸性食物。最可能的并发症是
A.
上消化道出血
B.
溃疡穿孔
C.
幽门梗阻
D.
溃疡癌变
【单选题】问题21 单选 (2分) Section BDirections: In this part there is a passage followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C...
A.
It may constitute a challenge to computer programmers.
B.
It accompanies all machinery involving high technology.
C.
It can be avoided if human values are translated into their language.
D.
It has become an inevitable peril as technology gets more sophisticated.
【简答题】how computer encourage curiosity up interested when opportunities books becoming When I was growing ________, I was _________ in science and math and compu...
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