甲状腺次全切除术后引起呼吸困难的原因中错误的是
A.喉头急性水肿
B.双侧喉上神经损伤
C.气管软化、塌陷
D.双侧喉返神经损伤
E.手术野出血,压迫气管
参考答案:B
At present, many people would rather ________ in the country
because there is ________ pollution in the city. [ ]
A. live, more
B. to live, less
C. live, less
D. to live, more
虚拟局域网通常采用交换机端口号、MAC地址、网络层地址或______。
A.物理网段定义
B.操作系统定义
C.IP广播组地址定义
D.网桥定义