【单选题】Which of the following is NOT an example of artificial selection?
A.
the selection by a farmer of the best milk-producing cows for breeding
B.
a breeder's allowing only the fastest horses to reproduce
C.
the selection for reproduction of the best egg-laying chickens by the farmer
D.
an increase in the number of giraffes with long necks because of a decline in the number of low-lying plants used for feeding
【单选题】根据《中华人民共和国海关法》关于“法律、行政法规对履行海关业务的担保另有规定的,从其规定”的规定,下列选项中属进出口管理法律、行政法规另行规定设立担保的情形有:
A.
除法律、行政法规另有规定外,有违法嫌疑,但依法不予没收的进出口货物、物品当事人请求先予放行货物、物品的
B.
申请扣留有侵犯知识产权嫌疑的进出口货物,或者申请放行涉嫌侵犯专利权的货物的
【单选题】Which of the following is NOT true about natural selection?
A.
Natural selection favors adoptions that help a species to survive.
B.
Natural selection works against extreme changes in a species.
C.
Natural selection allows helpful new traits to spread through a population.
D.
Natural selection occurs in periods of severe environmental distces.
【单选题】4 Q5: Which of the following is a double-selection control statement?
【单选题】● Selection criteria for project selection include:
C.
contribution towards organizational goals
【单选题】零件图上中技术要求栏中注明C42, 表示热处理淬火后的硬度为( )。