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【简答题】
8 一个质量为m的质点在Oxy平面内运动,其位置矢量为 ,其中a、b和ω是正常数,试以运动学和动力学观点证明该质点对于坐标原点角动量守恒。
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举一反三
【单选题】（ ） has become the market trend of the century.
A.
E-commerce
B.
E-mail
C.
E-government
D.
E-journal
【简答题】补全对话 A: 1 is your favorite 2 ? B: 3 favorite subject is art. A: 4 do you like art? B: Because 5 interesting. A: 6 is your art teacher? B: My art teacher is Mr. Liu.
【单选题】Passage 1 — The Cost of Art 17.
A.
His art will be more expensive to buy.
B.
The price of his art will stay the same.
C.
His art will be less expensive to buy.
D.
His art will go on sale.
【简答题】Sang Lang has never lost her heart in (recover) ______ and has continued to do exercises and learn English.
【单选题】If the master has acted unreasonably， e．g． knowing of the danger in the port has still proceeded to enter it， and danger results， the Charterer will ________ ．
A.
be liable
B.
not be liable
C.
be paid
D.
not be paid
【简答题】The ______ in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America. A．illness B．virus C．weakness D．Attachment A． B． C． D...
【单选题】The(72)in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America．
A.
illness
B.
virus
C.
weakness
D.
attachment
【单选题】Passage 1 — The Cost of Art 18.
A.
Very expensive pieces of art.
B.
Pieces of art that are easy to recognize.
C.
A style that doesn’t represent the artist.
D.
Art that isn’t in demand.
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