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【单选题】
复方尿素法作血小板计数，其中尿素的作用是（ ）A.
破坏红细胞，起溶血作用
B.
阻止血液凝固，起抗凝作用
C.
固定血小板
D.
防腐
E.
固定白细胞
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【单选题】In 1878 Frederick W. Taylor invented a concept called scientific management,___of obtaining as much efficiency from workers and machines as possible.
A.
it is a method
B.
a method which
C.
called a method
D.
a method
【单选题】In 1878 Frederick W. Taylor invited a concept called scientific management, ____ of obtaining as much efficiency from workers and machines as possible.
A.
it is a method
B.
a method which
C.
called a method
D.
a method
【单选题】String、StingBuffer都是（ ）类，都不能被继承。A.staticB.abstractC.final###SX
A.
String、StingBuffer都是（ ）类，都不能被继承。 A.static
B.
abstract
C.
final
D.
private
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【单选题】（ 29 ） String 、 StingBuffer 都是 ______ 类，都不能被继承。
A.
） static
B.
） abstract
C.
） final
D.
） private
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