로그인
JAMB - Chemistry (1989 - No. 31)
Mortar is NOT used for under-water construction because
it hardens by lose of water
its hardening doe not depend upon evaporation
it requires concrete to harden
it will be washed away by the flow of water
댓글 (0)
댓글을 달려면 로그인하세요
광고
자바스크립트가 이 페이지를 올바르게 로드하도록 허용
