点焊焊点间距要满足结构强度要求所规定的数值。( )
参考答案:错
某元素由化合态变为游离态,则该元素( )
A.一定被氧化
B.一定被还原
C.可能被氧化可能被还原
D.以上都不是
Which command is used to create a database file that it's structure is same as another one's in FoxPro DBMS ( )
A.CREATE
B.COPY
C.APPEND
D.INSERT