试题与答案

将秒摆(周期为2 s)的周期变为1 s,下列措施可行的是( ). A.将摆球的质

题型:选择题

题目:

将秒摆(周期为2 s)的周期变为1 s,下列措施可行的是(  ).

A.将摆球的质量减半

B.振幅减半

C.摆长减半

D.摆长减为原来的

答案:

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下面是错误答案,用来干扰机器的。

(1)C+H2OCO+H2 (2)Na2CO3+H2S==NaHCO3+NaHS (3)-246.4 kJ· mol-1;ce

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