作用于飞机机身两侧的滚动力矩彼此相等,是()平衡。
A.俯仰
B.横侧
C.方向
D.上下
参考答案:B
---She’s seldom asked to do housework at home, she?
--- . Her parents are very busy with their work, so she has to do the laundry every day.
A.has; Yes
B.hasn’t; No
C.is; Yes
D.isn’t; No
在世界反法西斯战争史上,中国开辟了第一个大规模的反法西斯战场。中国人民的局部抗战和全面抗战开始的标志性事件分别是()
A.西安事变
B.九一八事变
C.七七事变
D.长征胜利