两只灯泡分别标有“10V4W”和“10V8W”的字样,将它们串联后,其中一只灯正常发光,而另一只灯泡发光很暗,则此时电源电压是 V,电路的总功率是 W。
15 6
Think and write. (想一想,写一写)
horse , sheep , hen ,lamb , goat , cow , cat , rabbit , dog , duck , pig
1. Which animals have four legs?
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2. Which animals have red eyes?
3. Which animals have two legs?
4. Which animals lay eggs?
5. Which animals eat grass?
便秘是指7天以内排便次数少于()
A.5次
B.4次
C.3次
D.2次
E.1次