计算下面各题.(得数保留一位小数)
7.5×4.3≈
7.85×6.3≈
(1)7.5×4.3≈32.3;
(2)7.85×6.3≈49.5.
We spend two hours _____ _____ English every day. [ ]
A. practise, saying
B. to practise, talking
C. practising, speaking
D. practising, speak
电缆隧道敷设方式的选择,应符合哪些规定?