根据句意及首字母提示完成单词。

1. My uncle's sons are my c        .

2. I'm a girl, and I'm my parents' d         .

3. He's my parents' son, and he's my b        .

4. This is a great p        of my family.

爆破帽为一端封闭，中间具有一薄弱断面的厚壁短管，爆破压力误差较小，泄放面积较小，多用于()容器。

A．低压

B．中压

C．高压

D．超高压