脑DSA检查可将导管置于（）
A.颈静脉
B.静脉窦
C.颈外动脉
D.椎动脉
E.椎静脉
参考答案：D
纸质包装材料包括纸、纸板及其制品，其在包装材料中处于次要地位。( )
We had to _________ the engine piece by piece for transport.
A．take up
B．take out
C．take off
D．take apart
