明清时期实行“海禁”政策的根本原因是()
A.商品经济和资本主义萌芽的发展
B.封建制度渐趋衰落
C.君主专制的空前加强
D.自然经济占统治地位
参考答案:D
今年小麦产量比去年减少二成,去年比前年增产二成,今年小麦产量和前年一样.______.
下列程序的输出结果是______。 #include<iostream> using namespace std; class Test public: Test()cnt++; ~Test()cnt--; static int Count()return cnt; private: static int cnt; ; int Test::cnt=0; int main() cout<<Test::Count()<<’’; Test t1,t2; Test *pT3=new Test; Test *pT4=new Test; eout<<Test::Count()<<’’; delete pT4; delete pT3; cout<<Test::Count()<<endl; return 0;