题目内容
（请给出正确答案）
[单选题]
以下哪些情况，相贯线为实线？（）
A.两实心圆柱相交
B.圆柱上打了一个与轴线垂直相交的圆柱孔
C.四棱柱内部打了“十字”相通的圆柱孔
D.实心圆柱与实心圆锥垂直相交
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A、#include <iostream> #include <string> using namespace std::string_literals; int main() { const char* s = R"Hello World"; std::cout << s; } 输出：Hello World
B、#include <iostream> #include <string> using namespace std::string_literals; int main() { const char* s = R"(Hello\n World)"; std::cout << s; } 输出： Hello\n World
C、#include <iostream> #include <string> using namespace std::string_literals; int main() { const char* s = R"Hello(Hello\n World)Hello"; std::cout << s; } 输出： Hello\n World
D、#include <iostream> #include <string> using namespace std::string_literals; // main().......... std::string s1 = "Hello\0World"; auto s2= "Hello\0World"s; s1.size()的值是5 s2.size()的值是11
E、#include <iostream> #include <string> using namespace std::string_literals; // main().......... auto s1 = "Hello\0World"s; s1的类型是 const char*
