双面闸板的胶芯,上平面磨损后,其下平面也擦伤,可以上下翻面重新安装使用。()
参考答案:错
As a developing country, we must keep ______ with the rapid development of the world economy.
A.move
B.step
C.speed
D.pace
国际企业选择多样化分销渠道模式的原因有哪些?