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【简答题】
机械加工所用的机械一般都是机床,因而机械加工实际上是在机床上所进行的加工。机械加工方法可以分成两大类。 -类是采用经过____、____或____等热加工方法所制造的毛坯,它的尺寸和形状不准确,表面粗糙。要改变这种毛坯的状态,必须切去一部分表面层金属,以达到尺寸和形状的准确要求。这种切去毛坯表面层金属的机械加工也称为____或____。
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举一反三
【单选题】生态系统的基本组成部分是( )。
A.
植物、动物、微生物及其生存环境要素
B.
生物环境要素和非生物环境要素
C.
植物、动物、微生物
D.
生存环境要素、生物环境要素、生活环境要素
【单选题】生态系统的基本组成部分是______。
A.
非生物环境要素、生物环境要素
B.
植物、动物及生存环境要素
C.
非生物环境要素、植物——生产者有机体、动物——消费者有机体、微生物——分解者有机体
D.
非生物环境要素、植物、动物
【简答题】Suppose you are taking an order in restaurant, please make a dialogue between you and waiter.
【单选题】When the sentence "The had made a mess of the house" is turned into passive voice, which of the following is CORRECT?
A.
A mess had been made in the house.
B.
A mess had been made by them.
C.
The house had been made a mess of.
D.
The house had been made a mess.
【单选题】It started raining，so she__________ the nearest house．A.made forB.made off
A.
It started raining，so she__________ the nearest house． A.made for
B.
made off
C.
made up
D.
made out
【单选题】生态系统的基本组成部分是( )。
A.
非生物环境要素、生物环境要素
B.
植物、动物、微生物及其生存环境要素
C.
植物、动物、微生物
D.
非生物环境要素、植物、动物
【单选题】When the sentence "They had made a mess of the house" is turned into passive voice, which of the following is CORRECT?
A.
A mess had been made in the house.
B.
A mess had been made by them.
C.
The house had been made a mess of.
D.
The house had been made a mess.
【单选题】The burglars broke into his house and______before the police arrived.
A.
made for
B.
made off
C.
made out
D.
made up
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