X-性连锁隐性遗传病()
A.马凡综合征
B.白化病
C.血友病
D.脑积水
E.13-三体综合征
参考答案:C
听说你的数学不错,你能用英语计算下列各题吗?
例: (five) + (four) - (one) = (eight)
1. (three) + (four) - ( ) = (one)
2. (four) + (one) - ( ) = (three)
3. (six) + ( ) - (four) = (five)
4. ( ) + (five) - (three) = (seven)
5. (two) + (eight) - (one) = ( )
一辆重15000牛轿车在平直的高速公路上匀速行驶1.8km,轿车上的速度表如图所示,在此过程中若轿车发动机的牵引力为450牛,则该车行驶中所受阻力是______N.