If it is necessary ( ) the cable tension more, use the turnbuckle.

单选题

If it is necessary ( ) the cable tension more, use the turnbuckle.

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判断题

It is necessary for elderly people to make friends

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单选题

If the pump is unserviceable replace it.

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单选题

It is not necessary to include a relocated chapter table of contents if the total chapter has been relocated, but the subsystem relocations should then be identified in the Table of Contents at the front of the book.

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单选题

Although a natural alternative,such as honey,can be used to sweeten food if this is necessary,we can in fact do without it.Nowadays fibre is considered to be an important part of a healthy diet.In white bread,for example,the fibre has been removed.But it is（ ）in unrefined flour and of course in vegetables.

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