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【简答题】
用 MP3302 搭建的 LED 手电筒驱动电路如下图所示,图上已经注明 abcde5 个测量点,回答以下问题: 1) 该电路中输入电压、输入电流、输出电压、输出电流分别在哪些测量点测量,如何测量? 2) 如果输入电流是 0.19A ,输入电压是 3.18V , cd 两端电压 2.89V , de 两端电压 0.18V ,电阻 R1 阻值 1 欧,则该驱动电源效率如何计算,值是多少?
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举一反三
【单选题】After the heavy snow, many students helped to clear away the snow ______ in our school.
A.
willingly
B.
sincerely
C.
properly
D.
calmly
【单选题】下列属于固定资产实质性测试程序的是( )。
A.
检查固定资产的取得和处置是否均依据预算制度的规定
B.
关注固定资产的有关授权批准制度是否得到切实执行
C.
对融资租赁增加的固定资产，获取融资租入固定资产的相关证明文件，检查其相应的会计处理是否正确
D.
检查固定资产的取得、记录、保管、使用、维修、处置等是甭有明确的责任划分
【多选题】When the station is closed because of the heavy snow, what should station officers do?
A.
A station officer should broadcast that the station is closed for the heavy snow reason.
B.
A station officer should guide the passenger to the transfer station for another ride.
C.
A station officer should advise the passenger to walk on the non-slip mat and leave the station safely.
D.
A station officer should tell the passengers to leave the station in order and take other transportation patiently.
【判断题】综合布线系统的最新国家标准有GB 50311-2016 《综合布线系统工程设计规范》和GB 50312-2016 《综合布线系统工程验收规范》。( )
A.
正确
B.
错误
【单选题】We couldn't see the road clearly the heavy snow.
A.
because
B.
because of
C.
so
D.
though
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