陆地应急撤离从飞机完全停稳到飞机上最后一人离开飞机，应在180秒内完成。
参考答案：错
He was watching TV. _____, his wife was cooking.[ ]
A. while
B. when
C. at the time
D. at the same time
上颌侧切牙特点不正确的是( )
A．唇面较窄小且圆突B．舌窝窄而深C．发育沟较中切牙明显D．牙根较中切牙细而稍长E．颈横面为卵圆形
