首页
普通专升本
成人高考
学位英语
在线刷题
最近学习
最近学习课程
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
您现在位置:
模拟考场
>
湖北成人高考
>
高起点
>
理科数学
>
浏览试题
[单选题]
[单选题]
A
B
C
D
收藏
查看答案
参考答案
试题答案:
B
答案解释:
本题考查对反三角函数的概念的理解.对于arcsin a这个符号可从以下三句话来理解: ①这是一个角; ②这个角在区间[-π/2,π/2] ③这个角的正弦值是a. 同理:arccos a这个符号可以从下面三句话来理解: ①这是一个角; ②这个角在区间[0,π]上; ③这个角的余弦值是a. 因此,本题的意思就是:在[0,π]上,求余弦值为-1/2的角.解这类问题要注意角的范围.
相关题目
命题甲:A=B;命题乙:sin A=sin B.则 ( )
热门试题
1.
6.“近朱者赤,近墨者黑”。这句话强调的是( )
2.
CThe Amish are often called the “Plain People.” Their home have no pictures on the walls, and no soft, comfortable furniture. The men wear dark trousers with white or blue shirts, and the women wear long dresses in dark colors. They ride in carriages pulled by horses.The Amish have a saying: “The old way is the best way.” Although the Amish accept some new ideas- they use new medicines, for example- their way of life has not changed much in 300 years. They do not use electric lights, telephones or TVs.Almost all Amish live on farms. They do not use modern machinery (机器),yet their farms are successful because the Amish work hard and take good care of their land and animals. Their farms are always small. The Amish think it is wrong to have more land or more money than they need to live upon. A few years ago some Amish farmers discovered oil on their land. They immediately sold their land moved away, without telling anyone about the oil.The Amish will not buy insurance (保险) of any kind. When there is trouble, they help one another. If an Amish farmer gets sick, friends and neighbors will milk his cows and plant his fields. If a house burns down, as many as 200 men will come and build a new house in one day.People are curious about the lives of the Amish. Every year thousands of people visit the part of Pennsylvania where most Amish live. Usually the Amish are not happy about the visitors, but they tolerate(容忍) them. Perhaps the Amish understand that the visitors want to experience, at least for a few days, the quieter, simpler Amish way of life.
3.
下列指标属于时间型经济评价指标的是()
4.
30.信息系统的性能评价指标通常不包括
5.
( )是以货币为统一计量单位对会计对象进行确认、计量、记录和报告的各种规范。业务性会计制度均属于会计核算制度。
热门试卷
成人高考专升本《政治》模拟试卷
去做题
已有3418做题
2020年湖北成人高考专升本政治模拟试题三
去做题
已有2214做题
成人高考专升本政治考试模拟试题及答案(1)
去做题
已有1901做题
湖北成考专升本政治真题(2021年)
去做题
已有1363做题
湖北成考高起点语文真题(2021年)
去做题
已有1221做题