[单选题]Is it possible to replace:是否可以将视频里向量扩容代码中的：lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
for (int i = 0; i < _size; i++) _elem[i] = oldElem[i];lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
in the vector expansion code in the video with: 替代为：lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
memcpy(_elem, oldElem, _size * sizeof(T));lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
P.S.This question involves the relevant knowledge of C++ P.S.本题涉及C++的相关知识lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
AYes, they are equivalent and there will be no problem. 是，二者是等价的，不会有任何问题。lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
BNo, because the range of elemental intervals for the two copies is different. 否，因为二者复制的元素区间范围不同。lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
CNo, because their efficiency are different. 否，因为二者的效率不同。lWA答案窝(daanwo.com)-大学生作业答案及考资分享平台
DNo, because whether the latter can achieve the purpose is related to element type T. 否，因为后者能否达到目的与元素类型T有关。