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【单选题】
光滑面约束只能限制物体( )的运动。A.
沿着接触表面公法线方向压入支承面
B.
沿着接触表面公法线方向背离支承面
C.
沿着接触表面公切线方向压入支承面
D.
沿着接触表面公切线方向背离支承面
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举一反三
【单选题】Why is the writer of the complaint not angry at getting no response to his first letter from the customer-care executive?
A.
Because the manager didn’t receive his letter
B.
Because the manager cares about the customer
C.
Because the writer sounded crazy and the manager may not believe him.
【单选题】Why is the Bookworm’s customer angry?
A.
Because he needs to find the record of The Bookworm account on his computer.
B.
He has been waiting for over a month for books he had ordered from the shop.
C.
Because BFK will only send out orders once payment has been received.
D.
Simon will find out the reason for the mistake.
【简答题】Why is the company returning the order to the customer? Because they are not able to ______.
【简答题】如图为细胞重要的生命活动图解。请据图回答下面的问题。 （1）A、B、C、D中，染色体结构动态变化主要发生在________过程中。 （2）细胞增殖的主要方式是________________。 （3）细胞分化是个体发育的基础，就同一个个体来说，乳腺细胞与心肌细胞的遗传信息____，形态、结构和生理功能不同，这是因为________。 （4）细胞的凋亡由于受到严格的由遗传机制决定的程序性控制，所以也...
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