单项选择题

电子邮箱地址包括()和电子邮件公司后缀? A.
用户名 B.
单位名 C.
姓名 D.
域名

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汽油的燃油经济性指标与发动机的特性和汽车的自重、车速及各种运动阻力如空气阻力、行驶阻力和爬坡阻力等大小、传动系的效率及减速比等都有关系。（）

A．对
B．错

单项选择题

It is crucial you present statistical information properly and accurately. Familiarize yourself with statistical concepts used for your study, including ________
A、tests (e.g. t-test, Fisher’s test, chi-square test, and multivariate multiple linear regression analysis)
B、parameters (e.g. distribution, mean, median, standard deviation and variance)
C、variables (whether categorical or numeric, discrete of continuous)
D、all of the above