科学技术在任何时代、任何条件下都是第一生产力。 ( )
参考答案:错
Children who are________to computer games will waste a lot of time playing them on the Internet.[ ]
A.addicted
B.accustomed
C.familiar
D.similar
一般来说,可浮性按下列顺序递增的是()
A.亮煤、镜煤、暗煤、丝炭
B.丝炭、暗煤、镜煤、亮煤
C.丝炭、暗煤、亮煤、镜煤
D.镜煤、亮煤、暗煤、丝炭