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【简答题】
某药物在健康志愿者体内的研究结果表明，静脉注射给药75mg后，血药浓度与时间的关系如下：C=Ae -at + Be -βt ，该式中A= 4.6mg/L．B=0.60mg/L，a= 1.2h -1 ，β= 0.05h -1 ， 试求 (1)k 12 ，K 21 ，k 10 ，V c ； (2)给药后经5小时血药浓度为多少？
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举一反三
【单选题】Instruction: Read the paragraph below. Choose the best topic sentence for each paragraph on the line provided.
A.
You can learn by living in a foreign country.
B.
We should live in a foreign country for a while.
C.
Some benefits you can get by living in a foreign country.
【单选题】Instruction: Read the paragraph below. Choose the best topic sentence for each paragraph on the line provided.
A.
Small colleges are friendlier than large universities.
B.
Some reasons are stated for attending a small college instead of a large university.
C.
An excellent education you can get at a small college.
【单选题】用炽灼残渣项下得到的残渣检查重金属时,炽灼温度为
A.
500℃~600℃
B.
600℃~700℃
C.
700℃~800℃
D.
800℃~900℃
E.
900℃~1000℃
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