—I’m leaving for Canada on a study trip next week.
—___________________.
A.Enjoy your timeB.That’s all right
C.You’re welcomeD.It’s a pleasure
A解析:
這里考核的是語言功能,因為對方下周要去加拿大去學(xué)習(xí)旅行,所以要祝他/她“旅途愉快”。
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科目:初中物理 來源: 題型:閱讀理解

(2013?邢臺模擬)閱讀短文,回答問題.
LED燈
夜幕下,我市馬路邊LED燈亮化工程形成了一道亮麗的風(fēng)景.這種LED燈是通過光電轉(zhuǎn)換來供電的.圖是利用太陽能給LED路燈供電的自動控制電路的原理示意圖.其中,R是光敏電阻,此光敏電阻的阻值R、流過線圈也流I與光照度E(單位勒克斯,符號lx)之間的幾次實驗數(shù)據(jù)如下表所示.當線圈A中的電流I≥30.0mA時,動觸點D與靜觸點G、H接觸.
光照強度E/lx 5 10 15 20 25 30
光敏電阻R/Ω 60 30 20 15 12 10
線圈中電流I/m A 21.4 27.3 30.0 31.6 32.6 33.3
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15
15
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(3)一只功率為6W的LED燈,其正常發(fā)光亮度相與30W的日光燈相當.某間教室有20 盞30W的日光燈,每天平均使用3h,如果能用6W的LED燈替換,則一個月(按 30天計算)可節(jié)約電能
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(4)但有部分市民反映LED路燈亮度不夠,請你提出一條能提高亮度的合理化的建:
多安裝一些路燈、使用功率更大的LED燈
多安裝一些路燈、使用功率更大的LED燈

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科目:初中物理 來源: 題型:閱讀理解

閱讀短文,回答問題.
LED燈
夜幕下,我市馬路邊LED燈亮化工程形成了一道亮麗的風(fēng)景.這種LED燈是通過光電轉(zhuǎn)換來供電的.圖1是利用太陽能給LED路燈供電的自動控制電路的原理示意圖.其中,R是光敏電阻,此光敏電阻的阻值R、流過線圈電流I與光照度E(單位勒克斯,符號lx)之間的幾次實驗數(shù)據(jù)如下表所示.當線圈A中的電流I≥30.0mA時,動觸點D與靜觸點G、H接觸.當線圈A中的電流I<30.0mA時,動觸點D與靜觸點E、F接觸.
光照強度E/lx 5 10 15 20 25 30
光敏電阻R/Ω 60 30 20 15 12 10
線圈中電流I/m A 21.4 27.3 30.0 31.6 32.6 33.3
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科目:初中物理 來源: 題型:閱讀理解

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科目:初中物理 來源: 題型:閱讀理解


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