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【单选题】
当总效用增加时,边际效用A.
为正值，且不断增加
B.
为正值，但不断减少
C.
为负值，且不断增加
D.
为负值，但不断减少
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反馈参考答案：
举一反三
【单选题】When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.
A.
water in the tanks or pipelines
B.
having the cargo too cool
C.
explosion of vapors after discharge
D.
inadequate ullage space
【简答题】麻纤维的主要组成物质为 ,毛纤维的主要化学组成是 ,丝纤维的主要组成物质为 。
【单选题】Please read the following paragraph and judge which are supporting sentences.1)In our society, young children are facing many dangers.2) Threats to the well-being of children and adolescents represent...
A.
sentence 1) and 2)
B.
sentence 2) and 3)
C.
sentence2), 3) and 4)
D.
sentence2), 3), 4) and 5)
【单选题】Please read the following paragraph and judge which are supporting sentences. 1) In our society, young children are facing many dangers. 2) Threats to the well-being of children and adolescents repres...
A.
sentence 1) and 2)
B.
sentence 2) and 3)
C.
sentence2), 3), 4) and 5)
D.
sentence2), 3) and 4)
【单选题】Please read the following paragraph and judge which are supporting sentences. 1) In our society, young children are facing many dangers. 2) Threats to the well-being of children and adolescents repres...
A.
Sentence 1) and 2)
B.
Sentence 2) and 3)
C.
Sentence 2),3) 4) and 5)
D.
Sentence 2),3) and 4)
【单选题】※患者男,37岁。炎热夏天,在室外连续工作7小时,出现剧烈头痛.头晕.眼花.耳鸣.呕吐.烦躁不安等症状,体温不高,考虑为
A.
中暑
B.
热衰竭
C.
热痉挛
D.
热射病
E.
日射病
【单选题】管理学家( )从行为科学的角度研究目标管理，提出：工作成果=决策的质量×激发人们履行决策的动机。
A.
E·C·施勒
B.
彼德·德鲁克
C.
D·麦格雷戈
D.
R·利克特
【单选题】The biggest dangers ______________ an area that politicians barely mention: the labor market.
A.
lie on
B.
lie to
C.
lie in
D.
lie with
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