Normally,for each cup of green tea,( )of tea leaf is enough.And for each potofoolong tea or pu’er tea,it’s better to use( )tea leaf.

单选题

Normally,for each cup of green tea,( )of tea leaf is enough.And for each potofoolong tea or pu’er tea,it’s better to use( )tea leaf.

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单选题

The emergency exit doors are used to facilitate evacuation that are not normally used for exit.

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单选题

It is( )install more than two washers for each bolt.

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单选题

_____is provided for each generator with selector switch to feed the current in each phase.

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问答题

each

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