1. Just produced, just collected or just made.

Step 2: OK.

3. Rare and novel

4. Problems and contradictions that need to be studied and solved

5. Accidents

6. Questions to be answered

Two.

in a few words

Deception and flattery

Spread slanderous language

Glorious oath

Nice words

Thousands of words

Three.

C bottom = 2π = 6π

S=6π× 10=60π

(π=? ) decide for yourself

1× 10000= 10000

10000÷60π= 1000/6 π

Four.

S=π×(0.6÷2)2 (squared )× 2 = 0.18 π.

S=π0.6× 1=0.6π

S total =(0. 18+0.6)π=0.78π.

(π = 3.14) 0.78× 3.14× 0.2 is about 0.49KG.