【单选题】Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
【单选题】It can be inferred from the passage that the Archaeopteryx were classified as birds on the basis of
【多选题】体系温度函数t=f(θ,x,y,z),下面关于温度函数对时间θ偏导数、全体导数及随体导数说法正确的是()
A.
t对θ的偏导表示温度随时间的变化,而其他量不随时间变化
B.
t对θ的全体导数表示不同时刻不同空间的温度变化,但与观察者的运动无关
C.
t对θ的随体导数表示流场质点上温度随时间和空间的变化率
【单选题】We rented the old house on the ______ that the landlord would paint it, but we were disappointed later.
【单选题】下面关于跟镜头的功能描述正确的是
A.
跟 镜头是一个从静态到动态,再从动态到静态的过程。从一个场景摇到另一个场景,代替常规镜头的切换法,加快影片节奏
B.
跟 镜头一般用于表现大场面、大纵深、多景物、多层次等复杂空间时独具的完整性和连贯性
C.
从人物背后跟随拍摄的跟镜头,由于观众与被摄人物视点相同,可以表现出一种主观性镜头,还可以随时抓拍,使观众有种身临其境的感觉
D.
跟 镜头内部节奏由紧到松,与推镜头相比 ,较能发挥感情.上的余韵,产生许多微妙的感情色彩