请画一风管法兰连接图例。
参考答案：
Luckily, the bullet narrowly missed the captain _______ an inch. [ ]
A. by
B. at
C. to
D. from
CD4分子是HIV壳膜蛋白gp120的受体，与CD4分子结合是HIV侵入并感染CD4+T细胞的机制之一。()
