You need to design router redundancy on the Company network. Which three protocols could be chosen for IP routing redundancy to protect against first-hop router failure？（） [" GLBP"," ICMP"," MSTP"," HSRP"," VRRP"," NHRP"]
自动扶梯或人行道的启动开关应为（）。 ["钥匙操作；","拆卸手柄开关；","可锁护盖式防误操作开关；","按钮开关"]
物体暗面的色彩是由（）组合而成。 ["固有色和环境色","光源色和环境色","复色和环境色","原色和环境色"]
（）是要求承包商提供的为保证工程预付款用于该工程项目，不准承包商挪作它用及卷款潜逃的担保。 ["A.投标担保 ","B.承包商履约担保 ","C.承包商付款担保 ","D.预付款担保"]
在淘宝网上，尽管有的商家同类产品定价比其他商家高，但是由于信用较高，客户评价较好，从营销量大增，该商家的定价策略采用的是（）。 ["声誉定价","撇脂定价策略","个性化定价策略","直接折扣"]
K-对策
