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【简答题】
( )是认识的基础,是一切科学知识的来源。
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举一反三
【单选题】Most geologists believe ______ from the remains of tiny marine plants and animals that died millions of years ago.
A.
what was formed petroleum
B.
that petroleum was formed
C.
when petroleum formed
D.
petroleum that formed
【单选题】四个电阻器的额定电压和额定功率分别如下:电阻器的电阻最大是
A.
220V 、 40W
B.
220V 、 100W
C.
36V 、 100W
D.
110V 、 100W
【多选题】企业持有现金的动机主要有( )。
A.
以满足正常生产经营秩序下的需要
B.
加快企业资金的流动性
C.
以应付紧急情况的现金需要
D.
为把握市场投资机会，获得较大收益
E.
持有以备增值获利
【单选题】Coral reefs are one of the most fragile, biologically complex, and diverse marine ecosystem on Earth. This ecosystem is one of the fascinating paradoxes of the bio- sphere: how do clear, and thus nutr...
A.
describing the effects of human activities on algae in coral reefs
B.
explaining how human activities are posing a threat to coral reef communities
C.
discussing the process by which coral reefs deteriorate in nutrient-poor waters
D.
explaining how coral reefs produce food for themselves
E.
describing the abundance of algae and filter-feeding animals in coral reef areas
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