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Which sentences will be put at the end of a speech? _______a. It is a great pleasure for me to be present at this ceremony.b. Finally, I wish this event great success and wish all of you a pleasant stayhere.c. I would like to extend my warmest welcome to all of you.d. This is a very happy and memorable occasion for me.e. I hope your visit here will be happy and memorable.f. It gives me great pleasure to have this chance of being with you all today.

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grow establish lead strength compete1. Johnny Depp is the ________ actor in Pirates of the Caribbean.2. The firm was soon firmly __________ in the town.3. Economic ________ is most important.4.Everyone in modern society faces keen _________from other people.5. The soldiers have __________ their defenses.

明朝出版了一本奇书叫《天工开物》,里面详细记载了明朝时期及前朝的各项技术,该书的作者是()

A. 宋应星
B. 沈括
C. 张衡
D. 马钧

机床和() 互相协助促进,将第一次工业革命时代推向了极致。

A. 电动机
B. 内燃机
C. 蒸汽机
D. 发动机

莫兹利开始车床的研制首先碰到的一个问题是,机器起动后,转速高,力量大,床身易动。他就用()制造床身,床身易动的问题便解决了。

A. 木头
B. 铸铁
C. 石头
D. 青铜

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