《医疗事故处理条例》将医疗事故分为四级,它们是根据()而分
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Thereasonwhyheadaptedtothenewsituationsquicklyisthathehasa_____attitude.
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.