Sailing directions are kept up to date by ______.
A.publicatons
B.notices to mariners
C.supplements
D.Annual Summary of Adiralty Notices to Mariners
第1题:
We were told that the stone figure _______ back to the 16th century was of great value. A. dated B. dating C. coming D. kept
第2题:
对于PN结,设P区电位为Up、N区点位为UN,说法正确的是: ()。
A.Up>UN
B.Up<UN
C.Up≥UN
D.Up≤UN
第3题:
5、在单词kept和popped的发音中,都存在辅音连缀。
第4题:
第5题:
在单词kept和popped的发音中,都存在辅音连缀。
第6题:
(1)在单词kept和popped中,是否存在需要失去爆破的音?请解释原因。