如果在光比很强的情况下，按景物明亮部位曝光，景物暗部层次效果是？（） ["A、层次极丰富","B、层次丰富","C、层次一般","D、层次损失"]
对客服务质量控制的三大目标是什么？
具有二强雄蕊的科是（） ["唇形科","茄科","马鞭草","玄参科","伞形科"]
蝶形花冠的组成包括（） ["1枚旗瓣","2枚翼瓣","1枚翼瓣","2枚龙骨瓣","1枚龙骨瓣"]
据选择的光圈值给出快门值的自动曝光模式是？（） ["A、光圈优先式","B、速度优先式","C、程序自动式","D、双优先式"]
河工建筑物的险情特点有哪些？
