300÷(12-25),
=300÷110,
=3000(米);
答:这条水渠全长3000米.
I have _________to English Weekly for five years. [ ]
A. subscribed
B. ordered
C. placed an order
D. bought
对“风险”错误的描述是()
A.坠落
B.设备烧损
C.电磁辐射
D.供电中断