增大桨叶角意味着什么?
参考答案:
桨叶角大,则几何桨距大。
Some people eat with their eyes. They prefer to order what _____ nice. [ ]
A. looks
B. smells
C. feels
D. tastes
19世纪中期,俄国资本主义工业发展缓慢的主要原因是[ ]
A.贵族争权夺利
B.政治动乱频繁
C.受到封建农奴制的阻碍
D.克里米亚战争的失败