城市轨道交通车辆转向架主要分为动力转向架和非动力转向架，也分别称为动车转向架和（）。
参考答案：拖车转向架
依据《企业职工伤亡事故分类标准》（GB6441-86）第4.2条，重伤是指相当于附录B表定损失工作日等于和超过（）日的失能伤害。
A.101
B.103
C.105
D.107
Attempts have been made for nearly three decades to increase the amount of precipitation from clouds by seeding them with salt or silver iodide. ()
A. Devices
B. Hypotheses
C. Efforts
D. Suggestions
