问题
单项选择题
下列表述中正确的是()
A.平均数反映离散性
B.极差反映集中性
C.中位数反映离散性
D.众数反映集中性
答案
参考答案:D
下列表述中正确的是()
A.平均数反映离散性
B.极差反映集中性
C.中位数反映离散性
D.众数反映集中性
参考答案:D
C) 根据短文内容,从下面方框中选择适当的单词或短语填空,使短文内容完整正确。
Now, an American company invented a key by using Bluetooth technology 3 help people drive safely. With the key, a driver can’t talk or send messages when driving a car. With Bluetooth technology, when the driver is driving, the phone will 4 all incoming calls and messages by itself with “I am driving now. I will call you later.” The only calls allowed out are to emergency services. When the driver 5 the car, he then can use the phone. This is all about saving lives and safer driving. |