规范做法是水开了开始蒸两到三分钟，我这边两层蒸的，所以直接冷水开蒸，约五分钟左右
1/35
2/35
3/35
4/35
5/35
6/35
7/35
8/35
9/35
10/35
11/35
12/35
13/35
14/35
15/35
16/35
17/35
18/35
19/35
20/35
21/35
22/35
23/35
24/35
25/35
26/35
27/35
28/35
29/35
30/35
31/35
32/35
33/35
34/35
35/35