请根据图中A、B两种固体物质的溶解度曲线,回答下列问题.
如图所示,电路中各元件的参数为:R1=R2=R3=10Ω,R4=30Ω,C=300μF,电源电动势E=6V,内阻不计,开始时开关S2断开,单刀双掷开关S1开始时接通触点2,求:
5.1÷1.7+6.5×2.4=____
—Is that ______ hat?
—No, it's not______. It's______.
补全下列单词。
①p____ddles
②n____mber
③neighborh____ ____d
④sl____pp____ry
⑤____ff____cial
⑥c____mp____titor
⑦m____ ____nt____ ____n
⑧h____lm____t
⑨c____mp____tition