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【判断题】
若 A 相似于 B ,且 A 为可逆阵,则 与 相似 .A.
正确
B.
错误
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举一反三
【单选题】—May I speak to Miss Brown , Please? — ____________
A.
Who are you?
B.
Who’s this?
C.
This is Miss Brown .
D.
My name is Kate Brown.
【单选题】The students ______ busily when Miss Brown went to geta book she ______ in the office.
A.
had written left
B.
were writing hasleft
C.
had written had left
D.
were writing had left
【单选题】In contrast to 50 years ago, most exports from low and middle income countries are now classified as:
A.
mineral products.
B.
services.
C.
agricultural products.
D.
manufactured products.
【单选题】在我国,更换笔记本电源适配器主要参考的是
A.
输出电压、电流、接口类型
B.
品牌、峰值功率、尺寸规格
C.
输入电压、峰值功率、尺寸规格
D.
输入电压、峰值电流、接口类型
【简答题】2 弹簧下面悬挂质量为50 g的物体,物体沿竖直方向的运动学方程为 x=2sin10t,平衡位置为势能零点(时间单位:s, 长度单位:cm)。(1) 求弹簧的劲度系数,(2) 求最大动能,(3)求总能。
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