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【多选题】
Which of the following statements about biodiversity are correct?
A.
Biodiversity is an important concept in ecology and evolution because genetic & phenotypic diversity are essential conditions for the occurrence of natural selection.
B.
Diversity gives species the ability to change over time in response to environmental conditions.
C.
Species that lack diversity may become extinct when the environment changes.
D.
Lack of diversity between and among species in the ecosystem can also impact the ability of the ecosystem to adapt to changing environmental conditions and stresses, such as changing weather patterns, invasive species, and pollution.
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【判断题】相声八德是李德钖、玉德隆、焦德海、张德全、周德山、马德禄、刘德治、李德祥。( )
A.
正确
B.
错误
【简答题】Q: What is the problem the woman is concerned about?
【多选题】(2010年第二大题第28小题)处于初创阶段的公司,一般不宜采用的股利分配政策有( )。
A.
固定股利政策
B.
剩余股利政策
C.
固定股利支付率政策
D.
稳定增长股利政策
【简答题】制动器是利用()降低机器的()或使其()的装置。按结构形式不同,常用的制动器有()制动器、()制动器和()制动器等三种。
【单选题】电厂输煤系统中常用的制动装置有带式逆止器、滚柱逆止器、电力液压制动器和()。
A.
制动器
B.
磁制动器
C.
动制动器
D.
应制动器
【简答题】表面力是指作用在流体体积()上,并与受作用的()成正比的力。
【单选题】患儿男,3岁。门诊测量血压,收缩压为84mmHg,推算其舒张压应为
A.
40mmHg
B.
45mmHg
C.
50mmHg
D.
55mmHg
E.
60mmHg
【判断题】自动扶梯常用的工作制动器有:块式制动器、带式制动器和盘式制动器。
A.
正确
B.
错误
【判断题】作用在流体上的表面力是指作用在流体内部每个质点上的力。( )
A.
正确
B.
错误
【单选题】Q: What was the problem with the early cars in Britain ?
A.
They consumed lots of petrol.
B.
They took two passengers only.
C.
They were difficult to drive.
D.
They often broke down.
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