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【简答题】
在图示电路中,已知:U S = 15 V,当 I S 、U S 共同作用时 U AB =12 V。那么当电流源I S 单独作用时,电压U AB 应为____V。
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举一反三
【单选题】以下描述正确的一项是 [ ]
A.
植物组织培养是指离体的植物器官或细胞培养成愈伤组织
B.
从免疫学的应用来看，给儿童服用小儿麻痹糖丸属于免疫预防
C.
单细胞蛋白是从微生物细胞中提取出来的
D.
动物细胞融合技术的最重要的用途是培养具双亲优良性状的经济动物
【简答题】The should be paid to the ‘group’ effort rather than the ‘self’ effort . A ． effort B ． attention C ． energy D ． strength
【单选题】Getting rid of bad habits is _____ forming a good one. [ ]
A.
an effort much as
B.
much an effort as
C.
as an effort much as
D.
as much an effort as
【单选题】关于肝血管瘤,下列描述中正确的是
A.
小血管瘤以高回声型多见
B.
临床症状多较明显
C.
左叶较右叶多发
D.
多数血管瘤结节内可见丰富的血流信号
E.
边界多不清晰
【单选题】Coordination Effort is necessary to coordinate the allocation of attention between ______________.
A.
Input Effort, Memory Effort and Output Effort
B.
Input Effort, Transformation Effort and Output Effort
C.
Analyzing Effort, Memory Effort and Production Effort
D.
Listening Effort, Memory Effort and Production Effort
【单选题】Getting rid of bad habit is________forming a good one. [ ]
A.
an effort much as
B.
much an effort as
C.
as an effort much as
D.
as much an effort as
【单选题】以下有关花药与花粉培养描述不正确的是（ ）。
A.
花粉培养是将花粉从花药中游离出来进行培养
B.
两者的目的都是诱导花粉细胞发育成单倍体植株
C.
花粉培养技术更复杂，比花药培养难度大
D.
花药属于细胞培养，花粉属于器官培养
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