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试证明： 设 .若对任意的x∈R 1 ，均有m(E△(E+{x}))=0，则 (i)m(E c △(E c +{x}))=0(x∈R 1 )； (ii)m(E)·m(E c )=0．
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举一反三
【单选题】下列人物关系表述错误的一项是:
A.
叔惠和世钧是同学，小说开始时他们和曼桢都在同一个工厂做事。
B.
曼璐的初恋情人豫瑾是位医生，多年后，曼桢的奶奶和妈妈都希望曼桢能和他结婚。
C.
翠芝是世钧大嫂的表妹，最后与世钧结婚，她真正喜爱的是叔惠。
D.
曼桢与祝鸿才生有一个儿子叫荣宝，祝鸿才是曼璐的情人。
【单选题】千呼万唤始出来,犹抱琵琶半遮面。作者这样写琵琶女出场意在强调
A.
拘于礼法，羞涩忸怩，不愿见陌生男人
B.
技艺高超，以艺自负，不屑于见做官人
C.
满怀怨恨，内心痛苦，无心见外人
D.
世态炎凉，人心叵测，不可见路人
【简答题】Make friends happy ________ they will love your presence.
【单选题】Dolphins have the power to make people feel better just by their presence, according to a leading marine biologist. 'I cannot explain it in scientific terms but, without any doubt, everyone who sees t...
A.
the relationship between dolphins and people
B.
the healing power of dolphins
C.
dolphins and people's depression
D.
animals and treatment of diseases
【简答题】国家颁布的《安全色》标准中，表示警告、注意的颜色是什么颜色? A:红色 B：黄色 C：绿色 D：蓝色
【简答题】make your presence the life of a gathering
【单选题】The presence of income taxes and imports make the multiplier
A.
fall in value but remain positive.
B.
rise in value.
C.
not change in value.
D.
become negative.
【单选题】Please choose the best translation for the sentence: "Your presence will make the competition more influential."
A.
你的出现将使比赛有影响。
B.
你的出现将使比赛更有影响力。
C.
您的出现将使比赛有影响。
D.
您的出席将使比赛更具影响力。
【单选题】Dolphins have the power to make people feel better just by their presence, according to a leading marine biologist. 'I cannot explain it in scientific terms but, without any doubt, everyone who sees t...
A.
the relationship between dolphins and people
B.
the healing power of dolphins
C.
dolphins and people's depression
D.
animals and treatment of diseases
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