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【判断题】
遥感概念是20世纪40年代提出来的。
A.
正确
B.
错误
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【简答题】______里面有5个千和8个一.
【简答题】2 1 3 里面有______个 1 3 ,______个 1 9 是1. 5 12 里面有5个______, 7 12 比 5 12 多______个 1 12 .
【简答题】用作图的方法求图4.5.3中的电流I0。图中,R2是非线性电阻元件,其伏安特性曲线如图4.5.1所示;R2是线性电阻元件;V0是外加直流电压。
【单选题】听力原文:W: What do you usually do on Sunday? M: I go to church in the morning, work in the garden in What does he usually do on Sunday evening?
A.
Go to church.
B.
Rest all day.
C.
Work in the garden.
D.
Read the paper.
【单选题】______ , and members of the congregation having returned, this church too will start out with ______ effort in the work that lies before them, which will be taken up by the different departments.
A.
The summer vacation is over great
B.
The summer vacation being over renewed
C.
As the summer vacation over refreshing
D.
Had the summer vacation been over sacred
【简答题】17个0.001是(     )。0.里面有(     )个百分之一。5.09里面有5个(     )和9个(     )。
【简答题】里面有5个(    ), 比 多(    )个 。
【简答题】30里面有5个( ); 24里面有( )个6。
【简答题】用作图的方法求图4.5.5中的电流I0。图中,R2=R3是相同的非线性元件,其伏安特性曲线如图4.5.1所示;R1为线性电阻元件;V0为直流电压。
【简答题】如图1-2-14所示,开关S闭合时伏特表的读数是2.9V,安培表的读数是0.5A;当S断开时伏特表 的读数是3V,外电路电阻R2=R3=4Ω。求: (1)电源的电动势E=______V和内电阻r=______Ω; (2)外电路电阻R1=______Ω。
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