多项选择题

Given：

Which two statements are true about the result if the default locale is Locale.US？（）

A.The value of b is 2.
B.The value of a is 3.14.
C.The value of b is 2.00.
D.The value of a is 3.141.
E.The value of a is 3.1415.
F.The value of a is 3.1416.

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单项选择题
Given that the current directory is empty， and that the user has read and write privileges to the currentdirectory， and the following： Which statement is true？（）

A.Compilation fails.
B.Nothing is added to the file system.
C.Only a new file is created on the file system.
D.Only a new directory is created on the file system.
E.Both a new file and a new directory are created on the file system.
单项选择题
Given： Which statement is true？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.Synchronizing the run（） method would make the class thread-safe.
D.The data in variable "x" are protected from concurrent access problems.
E.Declaring the doThings（） method as static would make the class thread-safe.
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