【判断题】《我愿意是急流》中 “我愿意是废墟,在峻峭的山岩上,这静默的毁灭,并不使我懊丧......”表达了诗人为爱人甘愿牺牲的深情。
【单选题】When the price of one of the two commodities changes, the demand of the two commodities changes in different directions, then the demand cross price elasticity of the two commodities is( ).
【判断题】When the commodities in a container are owned by only one party, then the container is called as FCL.
【判断题】英式服务的气氛很活跃,适用于零点餐厅,很少用于宴会。
【单选题】设 AB , BC , CD 是不在同一平面内的三条线段,则经过它们中点的平面和直线 AC 的位置关系是 ( )
【简答题】如图,在同一平面内有A、B、C三个点,根据要求画图: (1)作射线AB,直线AC,连接BC; (2)过B作AC的垂线段BD,垂足为D; (3)延长线段CB.
【单选题】下列叙述不正确的是 [ ]
A.
若点C在线段BA的延长线上,则BA=BC﹣AC
B.
在平面内,过一点有且只有一条直线和已知直线垂直
D.
若A,B,C三点在同一条直线上,则AB<AC+BC
【判断题】When the commodities has to be transported indirectly, then the partial shipment clause will be made in the sales contract.
【简答题】如图,三棱柱ABC-A 1 B 1 C 1 中,点A 1 在平面ABC内的射影D在AC上,∠ACB=90 ,BC=1,AC=CC 1 =2. (1)证明:AC 1 ⊥A 1 B; (2)设直线AA 1 与平面BCC 1 B 1 的距离为 ,求二面角A 1 -AB-C的大小.