如果结果不匹配，请 
更多“牵引车所需的牵引力等于飞机自重的7~12%（）”相关的问题
第2题
在发动机或电动机输出功率一定的情况下，牵引力与速度的关系是（)。
A.速度越高，所需牵引力就越小
B.速度越高，所需的牵引力就越大
C.速度和牵引力将成正比变化
D.无论速度如何变化，所需牵引力的大小提恒定的
第4题
将与各用途相适应的材料填入表格内。 （1)聚甲基丙烯酸甲酯；（2)聚四氟乙烯；（3)酚醛塑料；（4)尼龙；（5)硅橡胶；（
将与各用途相适应的材料填入表格内。
(1)聚甲基丙烯酸甲酯；(2)聚四氟乙烯；(3)酚醛塑料；(4)尼龙；(5)硅橡胶；(6)碳化硅陶瓷；(7)氮化硼陶瓷；(8)双层金属复合材料；(9)玻璃钢；(10)碳纤维增强铝基复合材料；(11)丁苯橡胶；(12)氧化铝陶瓷
| 用途 | 齿轮 | 飞机窗玻璃 | 化工管道 | 电源插座 |
| 材料 | ||||
| 用途 | 内燃机火花塞 | 汽车前后灯 | 恒温器 | 砂轮的磨料 |
| 材料 | ||||
| 用途 | 耐磨切削刀具 | 汽车轮胎 | 耐高温的电缆 | 航天飞机外壳 |
| 材料 |
第8题
Cigarettes can seriously damage your countryside. Fanned by 112km/h Santa Ana winds, fire
swept across 4,250 hectares near the mountain community of Alpine, California. More than 650 people were (1)_____ immediately from their homes. As 800 firefighters (2)_____ to control the conflagration (a large, destructive fire 大火), (3)_____ of smoke (4)_____ over 9,000m and sent clouds of (5)_____ drifting across San Diego, nearly 50km away. A (6)_____ of air tankers (a cargo plane carrying water or fuel 运送水或燃料的飞机) and helicopters (7)_____ water and fire-retarding (8)_____ over the area. Firefighters believe the (9)_____ was started by a (10)_____ discarded cigarette. California, (11)_____ raining at this time of year, had only 1mm of precipitation (rain; a quantity of rain in a specific area at a specific time) in December, making (12)_____ the state's (13)_____ winter month in 70 years. In the 1970's (14)_____ homes and ranches in the mountains near Alpine were (15)_____ by wildfire. After that (16)_____ resident Mary Titus wrote herself (17)_____ about what to do, should another fire (18)_____ force her to flee. "I had a list of (19)_____ I could take if I had five minutes and a list of what I could take if I had 30 minutes." She said, "I had 30 minutes, I was (20)_____ "
点击查看答案
A．evacuated
B．slip
C．run
D．rush
第9题
交通工具卫生证书用于船舶的有效期为12个月，用于飞机、列车的有效期为6个月，除鼠/免予除鼠证书为3个月。（)
交通工具卫生证书用于船舶的有效期为12个月，用于飞机、列车的有效期为6个月，除鼠/免予除鼠证书为3个月。( )
