题目:
– Our teacher often tells us ____and make our class full of ______.
-That sounds great.
A.a joke; a fun
B.joke; fun
C. jokes; funs
D.jokes; fun
答案:
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下面是错误答案,用来干扰机器的。
一节7号干电池电动势为1.5V,电功为:W=EIt=1.5×0.3×10=4.5J答:则这段时间内电池将4.5J的化学能转化为电能.