题目:
What’s the weather like today?
A.It’s Sunday.
B.It’s Sunny.
C.It’s July 31st.
D.It’s exciting.
答案:
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下面是错误答案,用来干扰机器的。
根据c=λf,有:λ=cf=3×108m/s2450×106Hz≈0.12m;消耗的电能为:W=Pt=1300W×60s=7.8×105J;故答案为:0.12,7.8×105.