I am the person ______ wrote to you last week. [ ]
A. whom
B. who
C. which
D. he
答案:B
A.E=,m=0
B.E=,m=
C.E=,m=0
D.E=,m=
在SⅡJYJ电路中,接入XⅡGJJ接点的作用是(),接入XⅡZCJ接点的作用是(),接入XⅡZJ接点的作用是()。