A、(A)登乘机车证
B、(B)工作证
C、(C)监察证
答案:C
A. (A)半波整流
B. (B)全波整流
C. (C)桥式整流
解析:解析: J257
A. (A)零
B. (B)10kPa
C. (C)30kPa