对于同一弧焊电源,当使用的负载持续率增大时,其许用电流应()
A.增加
B.减小
C.保持不变
参考答案:B
Either you or one of your students________ to attend the meeting that is due tomorrow.
A.are
B.is
C.have
D.be
《证券法》规定向特定对象发行证券累计达100人为公开发行。 ( )