滑模装置的电路、设备均应()
A.接零
B.接地
C.接零接地
参考答案:C
The boys were____ of theft and were all sentenced to impnsonment.[ ]
A.guilty
B.famous
C.known
D.clear
畜类动物骨骼组织占组织比例结构的______。
A.5%~10%
B.15%~20%
C.35%~40%
D.50%~65%