【单选题】椭圆两焦点为 F 1 (-4,0),F 2 (4,0),P在椭圆上,若△PF 1 F 2 的面积的最大值为12,则该椭圆的标准方程为( )
【单选题】主要发生于夏季有蚊子的季节,主要表现为怀孕母猪流产、产木乃伊胎、死胎等繁殖障碍,马发病后主要表现脑炎。该病可能是( )。
【单选题】Which is a common symptom of hyperventilation?
B.
Decreased breathing rate.
C.
Euphoria sense of well-being.
【单选题】由于社会制度的不同、政治观点的差异,海外旅游者可能对中国的方针政策及国情有误解,不理解,在一些问题上存在分歧,若有人站在敌对立场上进行攻击和污蔑,导游员要
【单选题】椭圆的短轴的一个端点到一个焦点的距离为5,焦点到椭圆中心的距离为3,则椭圆的标准方程是( )
A.
x 2 16 + y 2 9 =1或 x 2 9 + y 2 16 =1
B.
x 2 25 + y 2 9 =1或 y 2 25 + x 2 9 =1
C.
x 2 25 + y 2 16 =1或 y 2 25 + x 2 16 =1
【单选题】主要发生于夏季有蚊子的季节,主要表现怀孕母猪流产,木乃伊胎、死胎等繁殖障碍,马 发病后主要表现脑炎。该病可能是()
【单选题】若椭圆的对称轴为坐标轴,长轴长与短轴长的和为18,一个焦点的坐标是(3,0),则椭圆的标准方程为( )
【简答题】Once upon a time, there lived a family of mice in the kitchen此题出自2015年河北孝感中考英语真题及答案,河北孝感2015年中考试题英语问卷 综合填空阅读短文,用方框中所给词的正确形式填空,使短文通顺、连贯。方框中有两个为多余. hard, while, learn, come out, father, be, ...
【单选题】Which statement is true regarding the SART?
A.
It is a performance monitor attached to at least one S-band navigational radar system.
B.
It is a 9 GHz transponder capable of being received by another vessel's S-band navigational radar system.
C.
It is a performance monitor attached to at ~east one Xband navigational radar system.
D.
It is a 9 GI-Iz transponder capable of being received by vessel's X-band navigational radar system.