我国标准代号由()构成。
A、汉语拼音字母大写
B、英语字母大写
参考答案:A
古希腊数学家把1,3,6,10,15,21,…叫做三角形数,根据它的规律,第100个三角形数与第98个三角形数的差为( )。
Without Sir Tim, the father of www, keeping up with the latest ______ so convenient.
A.would be
B.wouldn’t be
C.would have been
D.wouldn’t have been