下列关于简单机械的理解,错误的是( ) A . 车能轻松上山,盘山公路可看作是一个斜面 B . 汽车方向盘是一个变形的杠杆,其本质是一个等臂杠杆 C . 将绳子把两根光滑的木棍绕起来,可以看作是滑轮组 D . 蜡烛跷跷板在两端蜡烛都点燃时能上下摆动,因此可以看作是一个杠杆 答案:B
Remember not to telephone me after eight _________ a meeting then.
[ ]
A.
will have
B.
will be having
C.
have been having
D.
have been had