婴儿化脓性脑膜炎最常见的病原菌侵入途径是()
A.呼吸道感染
B.胃肠道感染
C.皮肤化脓病灶
D.脐部感染
E.邻近组织感染扩散
参考答案:A
Steel, brick and cement are all necessary building materials _____ . [ ]
A. with which to build a dam
B. which to build a dam with
C. building a dam with
D. to build a dam