<正> Aluminium and its alloy can be corroded in most atmosphere. It is particularly more severe in sea atmosphere due to the excessive presence of chloride ion
<正> Computer- Assisted English Language Learning (CALL) is known to be a fast expanding field and, as one would expect, there have been some important changes
<正> Let the n-pie stationary sequence ξ(t)=(ξ_1(t), …, ξ_n(t))' (t=0, ±1, …) be regular and of full rank, and then-ple the spectral density of st