高强度螺栓不正确的紧固方法是下列哪一种？

单项选择题— I think my English teacher is nice. — ________. He can make his class interesting. A、I'm afraid not B、I think so C、 I don't think so D、I'm not sure

单项选择题以下关于容器迭代器操作，合法的是? A、list l(10); list::iterator it=l.begin()+2; B、queue q; sort(q.begin(), q.end()); C、vector v(5); if (v.begin() D、set s; int set_size=s.end()-s.begin();