若x<1，则-2x+2________0（用“>”“=”或“<”号填空）
>
∵x<1
∴x-1<0
∴不等式两边都乘以-2得:-2x+2>0
The magician picked several persons from the audience and asked them to help him with the performance.
A．by accident
B．on occasion
C．at random
D．on an average
灾区内严禁通过口具讲话，使用绞车上下是的音响信号是如何规定的？（）
A.1声--慢下
B.2声--上升
C.3声--下降
D.4声--慢上
