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【单选题】
初产妇，25岁。妊娠足月。1年前有流产史。胎儿顺利娩出4分钟后，出现阴道暗红色间歇流血，约100ml。首先应考虑的原因是A.
子宫收缩乏力
B.
凝血功能障碍
C.
胎盘植入
D.
胎盘部分剥离
E.
宫颈裂伤
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【单选题】About a century ago more people would not have appreciated the study of a foreign language as they do today. Gone are those days when patriotism towards one's own language was a major obstacle to lear...
A.
it was too difficult
B.
it was not allowed
C.
it was taught by foreign rulers
D.
it was seen as disloyalty
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【单选题】下列关于苷键的分类叙述错误的是( )
A.
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B.
根据生物体内的存在形式可分为 : 原生苷 , 次生苷。
C.
根据苷元的不同可分为 : 强心苷 , 皂苷。
D.
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【单选题】According to the records available, human beings have been engaged in the study of language for ______centuries.
A.
10
B.
15
C.
20
D.
25
【单选题】______ refers to the study and analysis of the mistakes made by second and foreign language learners.
A.
Contrastive analysis
B.
Error analysis
C.
Interlanguage
D.
The behaviorist approach
【简答题】双座止回阀输出端接气控二位三通阀控制端且二位三通阀有控制信号时,气源截止,则该组阀件的逻辑关系是 。A. 与门 B. 或门 C. 或非门 D. 与非门
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