素描的造型四个因素有形体、结构、空间（）。 ["黑白","轮廓","线条","明暗"]
半蹼足
What is the recommended distance between controller-based access points for support ofroaming？（） ["50 feet [15 meters]","200 feet [60 meters]","150 feet [45 meters]","100 feet [30 meters]"]
频闪融合阂限检查法，一般以下述哪个指标表征疲劳的理论（） ["融合度","闪变度","频闪融合变化率","日间或周间变化率"]
标准普尔公司把债券的评级定为四等十二级，其中表示“中上级，较少风险，支付能力较强，在经济环境变动时，易受不利因素影响”的是（） ["AAA级","BBB级","A级","AA级"]
不偶合系数
