scalar multiplication - forms a vector
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Mur said it could take 18 months to develop the lateral flow prototypes, then between three to five years to further test them for accuracy.，详情可参考新收录的资料
That hadn’t been true with my first editor. He never demanded a proposal. Instead he said: “Just write me a two-page letter describing the book.” That took me a day to do—and I got a contract.