卵囊（egg sac）
卵囊（egg sac）
相关考题：
What do you eat for your meal? --- I eat ______ .A、a egg and some breadsB、an egg and some breadC、an egg and some breads
有如下程序: include using namespace std; class Sac{ int n; public: Sac():n(4){co 有如下程序：include＜iostream＞using namespace std;class Sac{int n;public:Sac():n(4){cout＜＜n;}Sac(int k):n(k){cout＜＜n;}~Sac(){cont＜＜n+n;}};int main(){Sac s1,*s2;s2=new Sac(3);delete s2;return 0;}运行时的输出结果是______。
单选题卵子分别受精（）A双卵双胎B单卵双胎，双羊膜囊、双绒毛膜C单羊膜囊双胎妊娠D联体儿E单卵双胎，双羊膜囊、单绒毛膜