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【简答题】
化学反应中常伴随一些热量的变化，有些反应放出______，如木炭、硫黄、等物的燃烧；有些反应则______，如______．生活中也经常会遇到一些不同能量间的相互转化，例如，我们常使用的干电池，就是将化学能转变为电能的．请再举出二个生活中能量转换的例子______．
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举一反三
【单选题】All of the following statements are the advantages of inflatables EXCEPT that______.
A.
they are much lighter than traditional modules
B.
they are less expensive to launch
C.
they can expand to larger room
D.
they can fit current rockets
【简答题】ADC0809的转换时钟一般为 Hz,可采用单片机的 信号,再经过 的方法获得。
【单选题】According to Fields, all of the following are the advantages of his technique EXCEPT that ______.
A.
it is environmentally friendly
B.
it is safe to the people's health
C.
it is more effective than pesticides against some insects
D.
it is cheaper than pesticides
【简答题】All of the following are advantages of expert programs EXCEPT that [A] they have an indefinite life span. [B] they cost little to reproduce. [C] many copies can be made available. [D] they are self-an...
【简答题】ADC0809的转换时钟一般为()hz,可以采用单片机的()信号,再经过()的方法获得。
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