以下哪个不是锆石的特征()
A.强火彩
B.刻面棱重影
C.高热导率
D.高折射率
参考答案:C
We’ll have to race _____ the clock to complete the work on time.
A.beyond
B.over
C.from
D.against
有以下程序:#include <iostream>using namespace std;class sampleprivate: int n;public: sample() sample(int m) n=m; sample add(sample s1,sample s2) this->n-s1.n+s2.n;return (*this); void disp() cout <<"n="<<n<<end1; ;int main ( sample s1(10),s2(5),s3; s3.add(s1,s2); s3.disp(); return 0;程序运行后,输出的结果是
A.n=10
B.n=5
C.n=20
D.n=15