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请将下列段落翻译成汉语:there are three hydraulic systems in A320/B737. If one of them fails, we can switch to other working hydraulic system. They can provide hydraulic power, too, so it won’t affect flight safety.

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Corporal punishment has been practiced in familites for quite a long time. In recent years, people's attitudes towards this practice have undergone drastic changes. Nowadays many people strongly oppose it. Should corporal punishment be abolished?请根据所给内容,拟写一个议论文开头。

用完整句子回答下列问题:1) What's the function of hydraulic system?2) What would be the possible consequences of hydraulic failure?3) What will you do if there is hydraulic failure during flight?

与生产数量没有直接联系,而与批次成正比的成本有( )

A. 缺货成本
B. 储存成本
C. 调整准备成本
D. 单位储存成本

一般不涉及新的固定资产投资,只涉及一年以内的一次性专门业务,并仅对该时期内的收支盈亏产生影响的决策为( )

A. 短期经营决策
B. 长期投资决策
C. 风险决策
D. 控制决策

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