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【单选题】
下列不属于油溶性抗氧剂()。A.
枸橼酸
B.
酒石酸
C.
磷酸
D.
卵磷脂
E.
维生素C
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反馈参考答案：
举一反三
【单选题】当一个Web控件上发生的事件需要立即得到响应时,应该将它的_属性设为true。
A.
PostBack
B.
IsPostBack
C.
AutoPostBack
D.
以上都不对
【单选题】施工承包方式的典型模式为（ ）。
A.
“设计+施工”
B.
“设计+招标+施工” $amp>amp>amp>amp>amp$gt
C.
“设计采购建造”
D.
“工厂设备与设计+施工”
【简答题】当一个Web控件上发生的事件需要立即得到响时,应该将他的 属性设置为true。
【多选题】How do enzyme-coupled receptors work?
A.
Enzyme-coupled receptors are transmembrane proteins that display their ligand-binding domains on the outer surface of the plasma membrane. The cytoplasmic domain of the receptor either acts as an enzyme itself or forms a complex with another protein that acts as an enzyme.
B.
Enzyme-coupled receptors were discovered through their role in responses to extracellular signal proteins that regulate the growth, proliferation, differentiation, and survival of cells in animal tissues.
C.
Most of these signal proteins function as local mediators and can act at very low concentrations (about 10ˉ 9 to 10ˉ 11 M). Responses to them are typically slow (on the order of hours), and their effects may require many intracellular transduction steps that usually lead to a change in gene expression.
D.
The largest class of enzyme-coupled receptors consists of receptors with a cytoplasmic domain that functions as a tyrosine kinase, which phosphorylates particular tyrosines on specific intracellular signaling proteins. These receptors, called receptor tyrosine kinases (RTKs).
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