单词拼写。

1. My father and mother are my _____ (父母).

2. Those are his _____ (兄弟).

3. Is she your _____ (祖母).

4. The _____ (相片) are very nice.

5. We have two _____ (家庭) here.

水力分级机内矿粒在沉降时的沉降方式是（）沉降。

A、自由

B、干涉