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【简答题】
某厂生产某种零件，每个零件的成本为40元，出厂单价为60元，该厂为鼓励销售商订购，制定了促销条件：当一次订购量超过100个时，每多订购一个，订购的全部零件的出厂单价就降低0.02元． （1）若销售商一次订购x（x＞100）个零件，直接写出零件的实际出厂单价y（元）？ （2）设销售商一次订购x（x＞100）个零件时，工厂获得的利润为W元（W＞0）． ①求出W（元）与x（个）之间的函数关系式及自变量x的取值范围；并算出销售商一次订购多少个零件时，厂家可获得利润6000元； ②厂家为了达到既鼓励销售商订购又保证自己能获取最大利润的目的，重新制定新促销条件：在原有的基础上又增加了限制条件--销售商订购的全部零件的实际出厂单价不能低于a（元）．请你利用函数及其图象的性质求出a的值；并写出实行新促销条件时W（元）与x（个）之间的函数关系式及自变量x的取值范围．（工厂出售一个零件利润=实际出厂单价-每个零件的成本）
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【简答题】According to mechanism the polymerization can be classified into ______ and ______.
【单选题】国家机关、军队、社会团体、企业事业组织、居民委员会、村民委员会,应当()本单位或者本居住区的适龄公民参加献血
A.
宣传和教育
B.
动员和组织
C.
教育和引导
D.
宣传和发动
【单选题】In the United States, someone is classified as unemployed if he or she
A.
does not have a job.
B.
does not have a job, or else has a job but is looking for a different one while continuing to work.
C.
does not have a job, has recently looked for work, and is collecting unemployment insurance.
D.
does not have a job, and is collecting unemployment insurance.
E.
none of the above
【单选题】In the United States, someone is classified as unemployed if he or she
A.
does not have a job.
B.
does not have a job, or else has a job but is looking for a different one while continuing to work.
C.
does not have a job, has recently looked for work, and is collecting unemployment insurance.
D.
does not have a job, and is collecting unemployment insurance.
E.
none of the above
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