某公司十月份电费是900元,比九月份电费节约了25%,九月份用电多少元?
900÷(1-25%),
=900÷0.75,
=1200(元);
答:九月份用电1200元.
石油通常不含()
A.烷烃
B.环烷烃
C.芳香烃
D.烯烃
有以下程序: #include<iostrearn> using namespace std; class sample private: int x; static int y; public: sample (int
A.; static void print (sample s); ; sample::sample(intA) x=a;y+=x; void sample::print(sample s) cout<<"x"<<s.x<<",y="<<y<<end1; int sample::y=0; int main() sample s1(10);sample s2(20);sample::print(s2);return 0; 程序运行后的输出结果是A) x=10,y=20
B.x=20,y=30
C.x=30,y=20
D.x=30,y=30