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【单选题】
常规的提取方法有（）A.
萃取法
B.
色谱法
C.
溶剂法
D.
沉淀法
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举一反三
【单选题】According to the passage, which of the following statements is true?
A.
The Chinese people have to give tips in western countries.
B.
The westerners don't have to give high tips in their own country.
C.
Barbers, hotel bellboys and all sorts of other people can earn a living if they are not tipped.
D.
Tipping varies from place to place, generally in the area of 20% of your bill.
【单选题】下列表述中关于价值规律的错误说法是( )。
A.
价值规律是资本主义经济特有的规律
B.
价值规律的原则是等价交换
C.
价值规律的表现形式是价格围绕价值自发波动
D.
价值规律既支配商品生产,又支配商品流通
【单选题】The______ power of the people in this town has been decreasing because most young people have left for the big cities.
A.
shopping
B.
purchasing
C.
enduring
D.
spending
【单选题】计算机联锁系统联锁机的故障—安全性是指( ):
A.
联锁机平均危险侧输出的间隔时间
B.
联锁机不发生危险侧输出的功能
C.
联锁机不发生危险侧输出概率
D.
联锁机在规定的时间和条件下完成联锁功能的概率
【简答题】整体护理的特点是什么
【单选题】According to the passage, which of the following statements is true?
A.
The Chinese people have to pay tips in western countries.
B.
The westerners don' t have to pay high tips in their own country.
C.
Barbers, hotel bellboys and all sorts of other people can earn a living if they are not tipped.
D.
Tipping varies from place to place, generally in the area of 20% of your bill.
【简答题】下列哪些说法是错误的?() A接种疫苗是预防一些传染病最有效、最经济的措施，儿童出生后可以随时随地接种疫苗 B在流感流行季节前接种流感疫苗可以减少患流感的机会但不会减轻患流感后的症状 C艾滋病、乙肝、丙肝都不会借助空气、水或食物传播 D与艾滋病、乙肝、丙肝感染者共用剃须刀和牙刷、文身和针刺不可能引起传播
【单选题】计算机联锁系统联锁机的故障——安全性是指（）。
A.
联锁机不发生危险侧输出的功能
B.
联锁机平均危险侧输出的间隔时间
C.
联锁机在规定的时间和条件下完成联锁功能的概率
D.
联锁机不发生危险侧输出的概率
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