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【单选题】
下列关于实验现象的描述正确的是:( )A.
磷在氧气中燃烧，产生大量白色烟雾
B.
木炭在氧气中燃烧，发出白色火焰，生成使澄清石灰水变浑浊的气体
C.
硫粉在氧气中燃烧时，发出蓝紫色火焰，闻到刺激性气味
D.
铁丝在氧气中剧烈燃烧，火星四射，生成黑色的四氧化三铁
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皮皮学刷刷变学霸
举一反三
【单选题】A study was carried out by Britain's NCC to ______.
A.
find out how many claims made by products fail to meet environmental standards
B.
inform. the consumers of the environmental impact of the products they buy
C.
examine claims made by products against ISO standards
D.
revise the guidelines set by the International Standards Organization
【简答题】reticular tissue
【单选题】The scaffold of hematopoietic and lymphoid tissue is( )
A.
loose connective tissue
B.
dense connective tissue
C.
reticular tissue
D.
adipose tissue
E.
elastic tissue
【多选题】Which of the following are basic types of tissue?
A.
connective tissue
B.
epithelial tissue
C.
muscle tissue
D.
nervous tissue
【单选题】The______was conducted to find out how many people prefer butter.
A.
examination
B.
inspection
C.
survey
D.
analysis
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