国家标准规定,安全电压额定值分为哪几个等级?
参考答案:
共分为42V、36V、24V、l2V、6V五个等级。
Are you the Spring Festival, Daming? [ ]
A. getting ready to
B. getting ready with
C. getting ready for
D. getting ready
QC小组例会的频率通常一个月()次。
A.1~2
B.1~3
C.2~3
D.4~5