下列( )选项是main( )方法的返回值类型。
A．int
B．void
C．boolean
D．static
参考答案：B
次大气层
Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.
A.outside
B.on class C fires
C.in an emergency
D.on class B fires
