题目

如图所示是检测某一传感器的电路图，这种传感器上标有“6V、1.8W”的字样（该传感器可看作一个纯电阻电器），滑动变阻器上标有“10Ω、1A”的字样，电流表的量程为0～0.6A，电压表的量程为0～3V．求： （1） 这种传感器的电阻R0是多少？ （2） 如果在a、b之间所加的恒定电压为6V、试分析当滑动变阻器的阻值变化时，电阻值为R0的传感器两端的电压变化范围． （3） 根据技术资料可知，如果测得该传感器的实际电阻与第（1）问中R0的　　Cloze 　　What do you think is important in language learning? The first and smallest subject that can be 1 about language is the word. In speaking, the choice of words is 2 the most importance. 3 selection will remove the 4 of likely breakdown in the communication. Too 5 , careless use of words prevents a meeting of the minds of the speaker and listener. The words used by the speaker may cause unfavorable reactions in the listener which 6 his understanding. 　　What's 7 , improper words may make 8 difficult for the listener to understand the 9 which is being passed on to him. The person 10 does not have special words in his 11 vocabulary may be 12 to explain in a 13 that can be understood by 14 listener. That shows we must learn to use words correctly 15 in language learning. 1． [　　] A．told B．spoken C．discussed D．said 2． [　　] A．of B．at C．for D．on 3． [　　] A．Wonderful B．Well C．Good D．Proper 4． [　　] A．possible B．level C．source D．acid 5． [　　] A．soon B．quickly C．usually D．often 6． [　　] A．encourage B．prevent C．offer D．affect 7． [　　] A．more B．that C．even D．ever 8． [　　] A．that B．it C．which D．who 9． [　　] A．speech B．sense C．message D．meaning 10． [　　] A．whom B．those C．which D．who 11． [　　] A．work B．working C．worked D．works 12． [　　] A．different B．possible C．difficult D．unable 13． [　　] A．voice B．means C．method D．way 14． [　　] A．his B．one's C．their D．our 15． [　　] A．at last B．at first C．at least D．only