对烤烟C1F色度和残伤描述正确的是（）。
A、色度浓、残伤≤5%
B、色度强、残伤≤15%
C、色度浓、残伤≤10%
D、色度强、残伤≤10%
参考答案：C
To______his great ambition of becoming well-known all over Denmark, Andersen, though very young, left home for Copenhagen to make his fortune.
A．hold up to
B．let up to
C．hang up to
D．live up to
主油缸乱换向由（）引起。
A.退活塞阀
B.泄油阀
C.螺纹插装阀
D.主阀块上的梭阀
