A:why.., that
B:that.., why
C:for.., that
D:why.., because
李小刚家到学校200米,他每天上学步行,大约要用5____.
电器工作时消耗的电功率与 ____ 、____ 有关。电功率的计算公式:P= ____ = ____ = ____ = ____