新设立的工程监理企业,其资质等级按最低等级核定,其暂定期为()年。
A.1
B.2
C.3
D.4
参考答案:A
Samuel Clemens, _______ as Mark Twain, was one of the most famous American writer.
A.to know
B.to be known
C.known
D.Knowing
由于直齿轮刚度变化比较人字齿轮陡,所以其寿命比人字齿轮()。