惯性阻力包括汽车整体质量保持原来的运动状态所产生的（）惯性阻力和由汽车各转动部件减、加速度所产生的（）惯性阻力。
参考答案：直线行驶、转动
Residents ________ not to go out alone or to take part in any groups during the period of recent terrorist activities.
A．were always being warned
B．are always warning
C．always warned
D．had always been warned
巩膜发育完全的时间是
A．胚胎第9个月
B．以上都不是
C．胚胎第3个月
D．胚胎第8个月
E．胚胎第5个月
