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一艘轮船自重5×107牛顿,最大载货量是1.3×108牛顿,当它满载时排水量是_______牛顿,受到的浮力是_______牛顿。
纸的出现是人类书写材料的一次革命,它极大地促进了文化的传播。下列人物中与纸的改进直接相关的是( ) A.屈原 B.张衡
In time of serious accidents, we know some basic things about first aid, we can save lives. A.whether
As _________ matter of fact,_________ beauty of _________ nature there made an excellent impression on me. A.a;the;不填 B.a;the;the C.the;the;不填 D.a;不填;the
在等差数列{}中,已知=16,则=.......................................................( ) A.12 B.16 C