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【简答题】
压电传感器本身的内阻抗很高,而输出能量较小,因此它的测量电路通常需要接入一个高输入阻抗的( )。其作用是:一、把它的高输出阻抗变换为低输出阻抗;二、放大传感器输出的微弱信号。
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【单选题】What does this paragraph imply?
A.
Most of us don't get enough exercise.
B.
We should exercise 15 minutes per day.
C.
A high pulse rate is more healthy.
D.
Regular exercise can strengthen our heart.
【单选题】下列叙述中哪项与利福喷丁不符
A.
为半合成抗生素
B.
结构中含有1，4-萘二酚结构
C.
C-3位为4-甲基哌嗪腙
D.
遇亚硝酸液易被氧化成暗红色的酮类化合物
E.
抗结核作用比利福平强2-10倍
【单选题】下列叙述中哪项与利福喷汀不符
A.
为半合成抗生素
B.
结构中含有 1,4- 萘二酚结构
C.
C -3 位为 4- 甲基哌嗪腙
D.
遇亚硝酸液易被氧化成暗红色的酮类化合物
E.
抗结核作用比利福平强 2-10 倍
【简答题】One thing the tour books don’t tell you about London is that 2,000 of its residents are foxes. They ran away from the city about centuries ago after developers and pollution moved in. But now that the...
【单选题】下列叙述中哪项与利福平不符
A.
为鲜红色或暗红色结晶性粉末
B.
遇光易变质，水溶液易氧化而损失效价
C.
为利福霉素C3引入4-环戊基哌嗪腙的半合成抗生素
D.
遇亚硝酸易被氧化成暗红色的酮类化合物
E.
体内代谢为仍具活性的脱乙酰基利福平
【单选题】One thing the tour books don't tell you about London is that 2,000 of its residents are foxes. As native as the royal family, they fled the city about centuries ago after developers and pollution move...
A.
environment is crucial for wildlife
B.
tour books are not always a reliable source of information
C.
London is a city of fox
D.
foxes are highly adaptable to environment
【单选题】One thing the tour books don't tell you about London is that 2,000 of its residents are foxes. As native as the royal family, they fled the city about centuries ago after developers and pollution move...
A.
environment is crucial for wildlife
B.
tour books are not always a reliable source of information
C.
London is a city of fox
D.
foxes are highly adaptable to environment
【单选题】下列叙述中哪项与利福平不符
A.
为鲜红色或暗红色结晶性粉末
B.
遇光易变质, 水溶液易氧化而损失效价
C.
为利福霉素 C3 引人 4- 环戊基哌嗪腙的半合成抗生素
D.
遇亚硝酸易被氧化成暗红色的酮类化合物
E.
体内代谢产物为脱乙酰基利福平
【简答题】\tGoing on a Self-tour or a Package Tour \t(1)有人喜欢自助旅游；\t(2)有人喜欢跟团旅游；\t(3)我的看法。
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