The controls of most modern airplanes can be operated either manually or automatically.
A、bythebookD
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Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
Somecosmeticsmanufacturersattempttocapturetherose'sunmistakablefragrance香味insoapsandperfumes.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
