用divide和separate或其构成的短语的正确形式填空

1. Fifteen _       by 3 is 5.

2. Will you___      _the bad apples _    the good ones?

3. Let's       ourselves____ several groups.

4. We          the money equally.

5. English is____   ____ France by the English Channel.

依据我国专利法专利有哪几种类型 各种类型的专利有效期为多长？