售后服务的内容下列不包括()。
A、产品送货服务
B、安装调试服务
C、维修服务
D、无意见调查及反馈记录
参考答案:D
当皮带传动装置的传动机构离地面()以下时,应当设防护罩进行防护。
A.4m
B.2m
C.3m
D.5m
At first the company refused to purchase the equipment, but this decision was ______ revised.
A. subsequently B. successively C. predominantly D. preliminarily