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一维流动的连续性方程υA=C成立的必要条件是______。 A理想流体；B黏性流体；C可压缩流体；D不可压缩流体。

一维流动的连续性方程υA=C成立的必要条件是______。

A理想流体；B黏性流体；C可压缩流体；D不可压缩流体。

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第1题

We very much （) that you are not in a position to entertain any fresh orders at presen

We very much () that you are not in a position to entertain any fresh orders at present.

A、regret

B、regret to learn

C、regretful

D、regrettable

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第2题

Dear Sirs,We were very surprised to learn from your call today that one of the books you o

Dear Sirs,

We were very surprised to learn from your call today that one of the books you ordered was damaged. We called our warehouse manager this afternoon and he confirmed that a new replacement will be delivered to you by DHL by tomorrow (147) the latest.

We truly regret the damaged delivery and the inconvenience it (148) you.

We have (149) taken the matter up with DHL and are sure that this will not happen again not only to you, but also to all our cherished readers.

Meanwhile, may we suggest that you trust us again and do business with us continuously.

(47)

A．at

B．to

C．for

D．in

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第3题

We regret to inform you that our computers are ____________ .

A．out of stock .

B．in stock

C．on stock

D．no stock

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第4题

______we appreciate your cooperation in giving us the information about your market, we regret that we are unable to reduce our price to the level you indicated.

A、Despite

B、Since

C、While

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第5题

Due to the great need of our goods, we regret to inform you that we can’t _____ your delivery date.

A．meet

B．agree

C．supply

D．stipulate

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第6题

We do not mean to be disrespectful when we refuse to follow the advice of our leader.A．ven

We do not mean to be disrespectful when we refuse to follow the advice of our leader.

A．venerable

B．respectful

C．famous

D．gracious

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第7题

We feel sorry but we have to inform you that the materials you ordered are out of stock. （regret)

We feel sorry but we have to inform you that the materials you ordered are out of stock. (regret)

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第8题

As we have quoted you our rock－bottom price, we regret that we are unable to （)any counter－offer.

A、accepting

B、entertain

C、receiving

D、take

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