准高速车辆的承载方式与普通车辆不同，普通车辆是以（）承载，准高速车辆是以旁承承载。
参考答案：心盘
people in the world are sending information by E-mail every day.
A．Several million
B．Many millions
C．Several millions
D．Many million
（描述疾病流行强度）暴发的概念。
