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【简答题】
超声波脉冲的传播速度随混凝土被烧温度的升高而 。
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【单选题】Seldom ________ video games ever since they entered college.
A.
they have played
B.
they played
C.
have they played
D.
they had played
【简答题】下面是一个中学生写给刘墉先生的信的正文,画线处有三处措辞不妥,请找出来并加以修改。 我能给您写信, 很为您感到荣幸 1 。您是华裔著名作家,知识渊博, 写了那么多书 2 , 给我们这些初生牛犊 3 以很深的影响 4 。我喜欢您的书,可 当地 5 偏僻,很难能买到。请您 受劳 6 为我邮一本您写的《萤窗小语》,并 恳请 7 您复信 教诲 8 。 (1) 改为 ; (2) 改为 ; (3) 改为 。
【单选题】Seldom____________ video games ever since they entered college.
A.
they have played
B.
they played
C.
have they played
D.
they have played
【简答题】设n维向量α=(a，0，…，0，a) T ，常数a＜0，已知矩阵A=E-αα T 的逆矩阵为 ，其中E为n阶单位矩阵，则a=______.
【单选题】Seldom ___ video games ever since they entered college.
A.
they have played
B.
they played
C.
have they played
D.
they have
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