以下关于通风机的运行调节，叙述正确的是（)。A．变极调速成本低、简单可靠、节能效果较好B．改变管网特

He set up in business __________ his own and was very successful.

A. in

B. of

C. on

D. by

luxury means very cheap thing .()

delicacy means food with very bad taste. ()

Our living standard is still very low, but we are ______ living in poverty.

A．by all means

B．by no means

C．by every means

D．by means of

Computers are very versatile. This sentence means ______.

A．computers are very expensive

B．computers can do many things

C．computers are very good to play with

D．computers are very cheap

A clean bill of lading means that the bill of lading is very clean．()

A．正确

B．错误

Very few people understood this contract， ______ was very obscure.

A. the language

B. the language of which

C. all it said

D. which it had said