Plasmids don't contain the genetic information for the essential metabolic activities of the cell, but they generally do contain genetic information for _
【单选题】下面程序的运行结果是( )。 #include<iostream> using namespace std class TestClass { static int n public: TestClass () { n++ } static int test() { for(int i=0i<4i++) n++ return n } } int TestClass::n=0 int main() ...