皮皮学，免费搜题
登录
搜题
【单选题】
光的世界丰富多彩，光学器件在我们的生活、学习中有着广泛应用。下列说法中不符合实际的是： [     ]
A.
手电筒的反射镜利用了凹面镜对光的会聚作用
B.
投影仪投影灯片时，片倒放在透镜的一倍焦距和两倍焦距之间
C.
借助放大镜看地图时，地图到放大镜的距离应大于一倍焦距
D.
自行车的尾灯是用平面镜将光沿反射回去，以便引起司机的注意
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【单选题】若a＞0，b＞0，且函数f（x）=4x 3 -ax 2 -2bx在x=1处有极值，则a+b等于（　　）
A.
2
B.
3
C.
6
D.
9
查看完整题目与答案
【单选题】若a=(6,-2),b=(1,x).且a〦b,则x的值为
A.
B.
3
C.
D.
-3
查看完整题目与答案
【简答题】Paraphrase the following questions. Number your answers please. 1 Now, at least, Europeans should stop believing that corporate wrong-doing is a US problem that cannot occur in the old continent. 2 In...
查看完整题目与答案
【判断题】The Ahold scandal indicates that corporate governance and accounting problems are universal in both the USA and Europe.
A.
正确
B.
错误
查看完整题目与答案
【判断题】Read the passage and decide whether the statements are true (T) or false(F) TRUE AND FAIR TRUE AND FAIR The collapse of companies such as Enron and WorldCom demonstrated the central role of accounting...
A.
正确
B.
错误
查看完整题目与答案
【简答题】请翻译以下内容: In Vivo Bioassays. The pot culture test method was adopted to evaluate fungicidal activities of the title compounds against Pseudoperonospora cubensis , Colletotrichum lagenarium , and Septor...
查看完整题目与答案
【单选题】定义A-B={x|x∈A，且x?B}，若A={1，2，4，6，8，10}，B={1，4，8}，则A-B=（　　）
A.
{4，8}
B.
{1，2，6，10}
C.
{1}
D.
{2，6，10}
查看完整题目与答案
【单选题】若方程8x 2 +2kx+k-1=0的两个实数根是x 1 ，x 2 且满足x 1 2 +x 2 2 =1，则k的值为（　　）
A.
-2或6
B.
-2
C.
6
D.
4
查看完整题目与答案
【单选题】Tasks related to tax management, cost accounting, financial accounting, and data processing are the responsibility of which corporate officer?
A.
Treasurer
B.
Controller
C.
Chief Operations Officer
D.
Chief executive Officer
查看完整题目与答案
【单选题】若x，y∈R，且2 x =18 y =6 xy ，则x+y为（　　）
A.
0
B.
1
C.
1或2
D.
0或2
查看完整题目与答案
相关题目：
【单选题】若a＞0，b＞0，且函数f（x）=4x 3 -ax 2 -2bx在x=1处有极值，则a+b等于（　　）
A.
2
B.
3
C.
6
D.
9
查看完整题目与答案
【单选题】若a=(6,-2),b=(1,x).且a〦b,则x的值为
A.
B.
3
C.
D.
-3
查看完整题目与答案
【简答题】Paraphrase the following questions. Number your answers please. 1 Now, at least, Europeans should stop believing that corporate wrong-doing is a US problem that cannot occur in the old continent. 2 In...
查看完整题目与答案
【判断题】The Ahold scandal indicates that corporate governance and accounting problems are universal in both the USA and Europe.
A.
正确
B.
错误
查看完整题目与答案
【判断题】Read the passage and decide whether the statements are true (T) or false(F) TRUE AND FAIR TRUE AND FAIR The collapse of companies such as Enron and WorldCom demonstrated the central role of accounting...
A.
正确
B.
错误
查看完整题目与答案
【简答题】请翻译以下内容: In Vivo Bioassays. The pot culture test method was adopted to evaluate fungicidal activities of the title compounds against Pseudoperonospora cubensis , Colletotrichum lagenarium , and Septor...
查看完整题目与答案
【单选题】定义A-B={x|x∈A，且x?B}，若A={1，2，4，6，8，10}，B={1，4，8}，则A-B=（　　）
A.
{4，8}
B.
{1，2，6，10}
C.
{1}
D.
{2，6，10}
查看完整题目与答案
【单选题】若方程8x 2 +2kx+k-1=0的两个实数根是x 1 ，x 2 且满足x 1 2 +x 2 2 =1，则k的值为（　　）
A.
-2或6
B.
-2
C.
6
D.
4
查看完整题目与答案
【单选题】Tasks related to tax management, cost accounting, financial accounting, and data processing are the responsibility of which corporate officer?
A.
Treasurer
B.
Controller
C.
Chief Operations Officer
D.
Chief executive Officer
查看完整题目与答案
【单选题】若x，y∈R，且2 x =18 y =6 xy ，则x+y为（　　）
A.
0
B.
1
C.
1或2
D.
0或2
查看完整题目与答案