【简答题】热机是把______能转化成______能的机器,______是最常见的热机.
【单选题】下列有关Bezier曲线性质的叙述语句中,错误的结论为( )
B.
Bezier曲线不一定通过其特征多边形的各个顶点;
C.
Bezier曲线两端点处的切线方向必须与起特征折线集(多边形)的相应两端线段走向一致;
D.
n次Bezier曲线,在端点处的r阶导数,只与r个相邻点有关。
【单选题】Which of the following statements about labor unions can be concluded based on the information in the passage?
A.
Labor unions reached their peak of power in the 1986's.
B.
It took labor unions many years to improve conditions for workers.
C.
The early labor unions failed .because they were not concerned with the well-being of workers.
D.
The early labor unions failed because they could not agree on what they wanted to fight for.
【简答题】热机的分类:最早的热机是______;其次是______;______;______.
【单选题】下列关于热机的效率,说法正确的是 [ ]
【简答题】______是最早的热机.现代热机种类繁多,构造各异,有______、______、______、______.
【单选题】Focus groups are representatives of customers whose job is to provide you with information on their needs and preferences. {A、B、C}
A.
焦点小组是顾客的代表,他们的工作是把你的需求和喜好提供给顾客。
B.
焦点小组是顾客的代表,他们的工作是给顾客提供需求和喜好。
C.
焦点小组是顾客的代表,他们的工作是给你提供他们的需求和喜好。
【单选题】How can the users of terminals without processing capability acquire the necessary information?
A.
They can simply use a keyboard or a mouse.
B.
They should use a modem to maintain the host system.
C.
They should connect their computer to a satellite system.
D.
They can access its base through the programs on the system.
【单选题】中国石窟艺术的早期(北魏和北周时代)。其洞窟形式有方形、长方形,采用( )的开凿方式,也是这个时期的主要形制, 这种开凿形制在以后是不多见的。
【单选题】下列有关Bezier曲线性质的叙述语句中,错误的结论为
A.
Bezier曲线可用其特征折线集(多边形)来定义
B.
Bezier曲线必须通过其特征折线集(多边形)的各个顶点
C.
Bezier曲线两端处的切线方向必须与特征折线集(多边形)的相应两端线段走向一致
D.
n次Bezier曲线,在端点处的r阶导数,不只与r个相邻点有关