问题
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乙烯的分子式是()。A.C2H6B.C2H4C.C2H2D.CO2
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下列公式中,选出正确的本表它页取公式。A、B2=’C2’@1B、B2=’C2’@’1’C、B2=C2@1D、B2=C2@’1’
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若两个电容C1>C2串联,则总电容为()。A.C1+C2B.C1-C2C.C1×C2/(C1+C2)D.(C1+C2)/(C1×C2)
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电容器C1、C2并联后,其总电容为()。A、C1与C2之和B、C1与C2之差C、C1与C2之积D、C1与C2之比
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设有定义语句:charc1=92 c2=92;则以下表达式中值为零的是()。A.c1∧c2B.c1&c2C.~c2D.c1|c2
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设有定义的语句:“char c1=92 c2=92;” 则以下表达式中的值为零的是( )。A.c1^c2 B.c1&c2
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