半挂车倒车时转向盘转动方向与单车倒车方向相反。
参考答案：对
It is _____ to come into the teacher's office without his permission. [ ]
A. bad manner
B. a manner
C. manners
D. bad manners
甲状腺功能亢进时不出现的表现是
A．速脉
B．心输出量增加
C．循环时间缩短
D．脉压减小
E．心律失常
