美国著名物理学家认为解决物理最前沿问题所以来的设备不是加速器而是什么()?
A、航天飞机
B、望远镜
C、全站仪
D、对撞机
参考答案:B
My parents ____in 1956, they _____for 20 years.
A.married, married
B.married, have got married.
C.got married, have been married
D.married, got married
用来加工外螺纹的是()
A、板牙
B、锉刀
C、丝锥
D、刮刀