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定义：设函数【图片】在数集【图片】上有定义，对应【图片】的值域是【图片】，如果对任何【图片】，在【图片】中有唯一的数【图片】，使【图片】，则这个对应法则定义了在数集【图片】上的一个函数，这个函数称为【图片】在【图片】上的（ ），记作【图片】
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皮皮学刷刷变学霸
举一反三
【单选题】Once the stimulus alters the receptor on the cell's membrane, what happens next?
A.
Ion channels open, allowing ions to enter or exit.
B.
The membrane permeability is altered.
C.
A second messenger is activated on the inside of the cell.
D.
Any of these actions could happen next.
【简答题】A.Put all his complaints in writing。 B.Wait and see what happens next。 C.Learn to say no when necessary。 D.Talk to his boss in person first。
【单选题】根据《麻醉药品和精神药品管理条例》，没有要求必须设置麻醉药品和第一类精神药品专库的企业
A.
麻醉药品药用原植物种植企业
B.
定点生产企业
C.
全国性批发企业
D.
区域性批发企业
E.
麻醉药品和第一类精神药品的使用单位
【单选题】The last sentence“And everyone knows what happens next”implies that in such cases ．
A.
farm animals will be in danger and have to be shipped away
B.
woIves will kill people and people will in turn kill them
C.
wolves wilI find enough food sources on famls
D.
people will leave the areas where wolves can live
【单选题】What happens in the next few days is _____ to our success.
A.
critical
B.
critic
C.
prior
D.
valid
【简答题】What happens in the next few days is _____ to our success.A. critical B. critic C. prior D. valid
【单选题】What happens next after the wool is cut from the sheep?
A.
washing
B.
spinning
C.
carding
D.
weaving
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