根据感染来源，原发感染为（）感染，原发后感染则多为（）感染。
参考答案：外源性；内源性
Jackson insisted that he ______ the old woman and that he ______ without any delay.
A．hadn’t murdered; be set free
B．shouldn’t have murdered; would be set free
C．wouldn’t murder; shouldn’t be set free
D．hadn’t murdered; could be set free
氯腐蚀有些什么危害？
