维生素B6存在的三种形式为

A. package, import, class
B. class, import, package
C. import, package, class
D. package, class, import

A. java.exe
B. javadoc.exe
C. javac.exe
D. javag.exe

A. public static void test1(){}
B. public void test2(){}
C. public test3(){}
D. public int test4(){return 0;}