()是选择目标客户的首要条件。 ["合法合规性","偿还能力","丰富资源","经营方式"]
在会展活动中,会展主办单位采集的观众信息可以为参展商所利用。
Prior to lighting off a cold automatically fired auxiliary boiler, yon should (). ["check and regulate the water level","close the air cock once fires are lit","blowdown the gage glass","crack the steam stop to assure protective steam flow"]
某些腐蚀,如污垢下腐蚀和沉积物下腐蚀,硫酸盐还原菌在沉积物下产生H2S的腐蚀,螺栓和螺帽之间腐蚀,垫圈和金属之间的腐蚀,实质上都上()腐蚀。 ["孔蚀","缝隙","电偶","全面"]
在PowerPoint 2003中,设置文本的段落格式的行距时,下列选项中不属于行距内容的是()。 ["行距","段前","段后","段中"]
什么是光纤,光在光纤中如何传播?