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【简答题】
某医药研究所开发一种新药，据监测，如果成人按规定的剂量服用该药，服药后每毫升血液中的含药量y（μg）与服药后的时间t（h）之间近似满足如图所示的曲线．其中OA是线段，曲线段AB是函数y=k?a t （t≥1，a＞0，k，a是常数）的图象． （1）写出服药后每毫升血液中含药量y关于时间t的函数关系式； （2）据测定：每毫升血液中含药量不少于2（μg）时治疗有效，假若某病人第一次服药为早上6：00，为保持疗效，第二次服药最迟是当天几点钟？ （3）若按（2）中的最迟时间服用第二次药，则第二次服药后在过3h，该病人每毫升血液中含药量为多少μg？（精确到0.1μg）
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参考答案：
举一反三
【单选题】If two men suspected for some reason that they have a common ancestor,______.
A.
we can decide according to their family tree
B.
we can find the truth from their genetic markers
C.
we can compare the differences in their Y chromosome
D.
we can look for written records to prove their relationship
查看完整题目与答案
【简答题】城镇化的一个错误是抹去具有历史意义的社区来建造千篇一律的(uniform)住宅区。 One mistake in ization is to erase historical communities .(in order to )
查看完整题目与答案
【单选题】Some counties import raw materials in order to manufacture finished products．
A.
有些国家进口生材料为了完成产品生产。
B.
有些国家进口原材料是为厂制造成品。
C.
为了生产结束品，有些国家进口未加工材料。
D.
为了制造产品，一些国家购买原材料。
查看完整题目与答案
【单选题】索引符号应用( )线来绘制。
A.
粗实线
B.
细实线
C.
中粗线
D.
虚线
查看完整题目与答案
【单选题】生活在江浙一带的人们大多数都喜欢饮用
A.
沱茶
B.
花茶
C.
绿茶
D.
乌龙茶
查看完整题目与答案
【单选题】According to the passage, what would a public relations personnel probably do after a decision is made in industry?
A.
Plan and have some promotional activities.
B.
Give some suggestions to the decision-maker.
C.
Set up communication with the public.
D.
Organize some special events like press conference.
查看完整题目与答案
【单选题】in order to
A.
为了……
B.
由于……
C.
因此
D.
造成……
查看完整题目与答案
【单选题】重力坝是蓄水工程中一种重要的挡水建筑物，它的基本剖面是指坝体在自重、静水压力和扬压力三项主要荷载作用下，满足稳定和强度要求，并使工程量最小的（）剖面。
A.
三角形
B.
四边形
C.
菱形
D.
梯形
查看完整题目与答案
【单选题】Radio and television are quite useful because you can __________ ．A． see what is ha
A.
27． Radio and television are quite useful because you can __________ ． A． see what is happening in the world
B.
hear what is happening to the world
C.
know what the world is like
D.
see what the people on the earth are doing'
查看完整题目与答案
【单选题】What can be deciphered from Japan’s trash codes?
A.
Japanese tend to present their remarks in an explicit way.
B.
Trash is public property from which neighbors may intrude upon one’s privacy.
C.
The language barrier is an obstacle to dealing with the trash business.
D.
People not following the correct trash protocol will be considered rude.
查看完整题目与答案
相关题目：
【单选题】If two men suspected for some reason that they have a common ancestor,______.
A.
we can decide according to their family tree
B.
we can find the truth from their genetic markers
C.
we can compare the differences in their Y chromosome
D.
we can look for written records to prove their relationship
查看完整题目与答案
【简答题】城镇化的一个错误是抹去具有历史意义的社区来建造千篇一律的(uniform)住宅区。 One mistake in ization is to erase historical communities .(in order to )
查看完整题目与答案
【单选题】Some counties import raw materials in order to manufacture finished products．
A.
有些国家进口生材料为了完成产品生产。
B.
有些国家进口原材料是为厂制造成品。
C.
为了生产结束品，有些国家进口未加工材料。
D.
为了制造产品，一些国家购买原材料。
查看完整题目与答案
【单选题】索引符号应用( )线来绘制。
A.
粗实线
B.
细实线
C.
中粗线
D.
虚线
查看完整题目与答案
【单选题】生活在江浙一带的人们大多数都喜欢饮用
A.
沱茶
B.
花茶
C.
绿茶
D.
乌龙茶
查看完整题目与答案
【单选题】According to the passage, what would a public relations personnel probably do after a decision is made in industry?
A.
Plan and have some promotional activities.
B.
Give some suggestions to the decision-maker.
C.
Set up communication with the public.
D.
Organize some special events like press conference.
查看完整题目与答案
【单选题】in order to
A.
为了……
B.
由于……
C.
因此
D.
造成……
查看完整题目与答案
【单选题】重力坝是蓄水工程中一种重要的挡水建筑物，它的基本剖面是指坝体在自重、静水压力和扬压力三项主要荷载作用下，满足稳定和强度要求，并使工程量最小的（）剖面。
A.
三角形
B.
四边形
C.
菱形
D.
梯形
查看完整题目与答案
【单选题】Radio and television are quite useful because you can __________ ．A． see what is ha
A.
27． Radio and television are quite useful because you can __________ ． A． see what is happening in the world
B.
hear what is happening to the world
C.
know what the world is like
D.
see what the people on the earth are doing'
查看完整题目与答案
【单选题】What can be deciphered from Japan’s trash codes?
A.
Japanese tend to present their remarks in an explicit way.
B.
Trash is public property from which neighbors may intrude upon one’s privacy.
C.
The language barrier is an obstacle to dealing with the trash business.
D.
People not following the correct trash protocol will be considered rude.
查看完整题目与答案
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