ZD6系列电动转辙机减速器的内齿轮伸出端锈蚀，表面粗糙度高时应更换新件。（）
参考答案：错
. Tom is the only one of the stall members who ______ to be promoted.
A．is going
B．are going
C．has been going
D．have been going
要式合同
