在 2*arctan2 到兀/4 上求函数（1－cosX）（sinX）^2的定积分.求详解.

______is the speed at which something moves in a particular direction.

A．Voltage

B．Velocity

C．Proportion

D．Frequency

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He subscribes to a number of journals______his subject.

A．relating

B．over

C．concerning

D．around

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母牛结核菌试验阳性，无明显症状，牛奶的处理原则是

A.60℃，30分钟

B.70℃，30分钟巴氏消毒后可食用

C.80℃，30分钟巴氏消毒后喂饲其他禽畜

D.禁止挤奶

E.消毒废弃

请帮忙给出正确答案和分析，谢谢！

Counsel for the defence submitted that his client was clearly______.

A．naive

B．innocent

C．simple

D．liable

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Weve already made it clear that we will not______to pressure.

A．twist

B．shrink

C．yield

D．settle

请帮忙给出正确答案和分析，谢谢！