题目内容
煤粉输送系统应设（)和杂物筛。
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1inch=（)mm,1bar=1（)。
A court order that prohibits a person from doing a certain act is termed as a（n)（).
An obligee who transfers the right to receive performance is called the（).
The()states that a merchant who offers to buy, sell, or lease goods and gives a written and signed assurance on a separate form. that the offer will be held open cannot revoke the offer for the time stated or, if no time is stated, for a reasonable time.
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