水产动物育种时，饲料饵料系数越高越好。

单项选择题

A．对
B．错

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Aloha from Hawaii was a 1973 TV special and a huge success. Which of the following statement is true about it? (M1L5)

A．)It captured more than 90% of the television audience in the US.
B．)It remains the most watched broadcast by an individual entertainer in television history.
C．) It was regarded as "something that would say 'America' to the world.
D．)It was Presley's last television show during his lifetime.

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伪影对于B超探查都无好处。
A、正确
B、错误

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网络计划中，任何一项工作的自由时差一定总时差。

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一个比例调节器其PB=200%，当输入的偏差信号变化10%时，调节器输出的变化是：
A、100%
B、20%
C、10%
D、5%

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病害三要素是指：
A、病原物
B、寄主植物
C、环境条件
D、人
E、农具

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请判断该形容词单复数写法是否正确：fácil-fáciles

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常用的福尔马林是()
A、40%的高锰酸钾溶液
B、40%的酒精溶液
C、40%的甲醛水溶液