怀孕期妇女注射狂犬病疫苗不会影响胎儿，这个说法对吗？
查询出EMP表中COMM字段为空的记录（） ["select * from emp where comm='';","select * from emp where comm=null;","select * from emp where nvl(comm)=0;","select * from emp where comm is null;","select * from emp where nvl(comm,0)=0"]
山茶的果实类型属于（） ["坚果","蒴果","核果","胞果"]
含笑叶序是（） ["对生","轮生","互生","簇生"]
被洪水包围后，最安全的自救措施是什么？（） ["跟随人群逃生","报警等待救援","尽快游泳逃生"]
什么样的情况属于卖家拒绝提供货到付款服务？
