题目内容

wetherthecontractbesigenddepends____anicefactorytour.

A. to
B. with
C. on
D. by

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Theproductionline____ismoreconvenientforus.

A. manual
B. half-automated
C. fullyautomated

Iwonderifitisconvenienttomeetyounextweek，please____aspecifictimeforourfactorytouring.

A. fix
B. set
C. repair
D. prepare

Ibelievethisfactorytouringwilldeepenmutualunderstandingand____ourcooperation.

A. increase
B. improve
C. enrich
D. promote

请叙述构造哈夫曼树的步骤。