![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[多选题]
油菜育苗时,苗床畦面宽为()
A.1.5-2m
B.1.3-1.5m
C.0.3-0.6m
D.0.8-1.0m
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
13-15M
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.1.5-2m
B.1.3-1.5m
C.0.3-0.6m
D.0.8-1.0m
13-15M
A.A-B-C-D-E
B.D-B-E-A-C
C.B-A-C-D-E
D.E-B-C-D-A
A.15
B.5
C.20
D.10
A.第三类杠杆,阻力臂长于动力臂,机械效能低
B.第二类杠杆,阻力臂长于动力臂,机械效能高
C.前牙所承受的咀嚼力较大,有利于维护单根前牙和其牙周组织的健康
D.由于前牙所承受的咀嚼力较大,故前牙牙根的唇面比舌面宽
E.前牙切咬食物时的运动距离为3.7cm
A.47.25c㎡
B.67.5c㎡
C.229.5c㎡
D.135c㎡
A.根部周围
B.酒花沟里
C.根茎处
D.畦面