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【单选题】
关于如下语句，说法正确的是：void main(){while(1){ LED1 = S1;LED2 = S2;}}A.
没看电路图，程序看不出LED1是亮还是灭
B.
S1闭合，LED1肯定亮
C.
S1闭合，LED1肯定灭
D.
LED1亮灭取决于LED2的状态
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【单选题】Which of the following is true with regard to products?
A.
The quality of products is far more difficult to measure than that of services.
B.
Products do not include experiences, organizations, persons, places, and ideas.
C.
Products are not meant for sale in the market.
D.
Products include services, events, persons, places, organizations, ideas, or a mixture of these.
【单选题】Which of the following is true in regard to bridges?
A.
Bridges do not isolate broadcast domains.
B.
Bridges broadcast packets into the same collision domain they were received from.
C.
Bridges use IP addresses to filter the network.
D.
Bridges can translate from one media to a different media.
【简答题】Cement Co is a company specialising in the manufacture of cement, a product used in the building industry. The company has found that when weather conditions are good, the demand for cement increases ...
【简答题】【图片】如图, 两个完全相同的电容器C1和C2，串联后与电源连接.现将一各向同性均匀电介质板插入C1中，则:_________(填入正确答案对应的字母，例如A)(A) 电容器组总电容减小.(B) C1上的电量大于C2上的电量.(C) C1上的电压高于C2上的电压.(D) 电容器组贮存的总能量增大.
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