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【简答题】
在烯烃的卤加成反应中,主要有哪几种卤化试剂?这些卤化试剂对烯烃的加成,分别是何种机理?
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皮皮学刷刷变学霸
举一反三
【单选题】对原发性视网膜脱离的描述下列哪一点错误:( )
A.
视网膜神经层与脉络膜分离
B.
突然发生视力减退
C.
早期出现闪光、视物变形
D.
玻璃体常有不同程度混浊
E.
有裂孔
【单选题】Which tissue of the plant is the outermost and can prevent the plants from drying out?
A.
Grooming tissue
B.
Minute tissue
C.
Connective tissue
D.
Dermal tissue
【单选题】The plant body is made up utimately of microscopic components called _____________ .
A.
roots
B.
shoots
C.
cells
D.
tissue
【单选题】The process to give off water (containing waste products) through the pores of the skin or the stomata of plant tissue.
A.
transpiration
B.
resistance
C.
infiltration
D.
biogeochemistry
【单选题】The food-conducting tissue in the plant is known as _____________ .
A.
arenchyma
B.
meristematic tissue
C.
sclerenchyma
D.
phloem
E.
xylem
【单选题】植物组织培养手册《A Handbook of Plant Tissue Culture》是下列哪位科学家编写的?
A.
Gautherete
B.
Miller
C.
White
D.
Murashinge
【简答题】Matching (1) hormone (a) a family of proteins found in blood and milk and muscle and in plant seed (2) plasma (b) the secretion of an endocrine gland that is transmitted by the blood to the tissue...
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