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【多选题】
下列哪些属于光学显微镜素材开发技术的特点？A.
样品需进行切片和制片，过程相对繁琐
B.
可对木材薄片进行染色处理，从而丰富木材美学素材
C.
通常放大倍数在 100—600 倍效果为佳
D.
需要使用切片机对试样进行切片
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【单选题】By the end of next year they ____ together for twenty years.
A.
will have worked
B.
had worked
C.
would work
D.
have worked
【单选题】《农产品质量安全法》规定,农产品生产企业和农民专业合作经济组织应当建立农产品生产记录。农产品生产记录应当保存( )年,禁止伪造农产品生产记录。
A.
一年
B.
二年
C.
三年
D.
四年
【单选题】Richard is an adult. He enters into a contract to sell sixteen-year-old Jane his car for $3,000. The next day Richard receives an offer of $4,000 for his car from twenty-year-old Bill. Richard
A.
cannot disaffirm his contract with Jane because he is an adult.
B.
can disaffirm his contract with Jane because Bill is an adult and contracts with adults take precedence over contracts with minors.
C.
cannot disaffirm his contract with Jane because she is a minor.
D.
can disaffirm his contract with Jane because the contract has not been ratified.
【单选题】By the end of next year she __________ for twenty years.
A.
will have been teaching
B.
will teach
C.
will have taught
D.
will be teaching
【单选题】以下关于OSPF协议的描述,错误的是()。
A.
OSPF协议直接用IP分组传送OSPF报文
B.
OSPF协议中，相邻路由器定期交换整个路由表信息
C.
OSPF协议中，所有路由器最终都能建立一个全网的拓扑结构图
D.
OSPF协议可以将一个自治系统划分成若干区域
【简答题】边际收益递减规律发生作用的一个重要前提条件是____。
相关题目：
【单选题】《农产品质量安全法》规定,农产品生产企业和农民专业合作经济组织应当建立农产品生产记录。农产品生产记录应当保存( )年,禁止伪造农产品生产记录。
A.
一年
B.
二年
C.
三年
D.
四年
参考解析：
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