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【判断题】
编码信道中传输的是编码后的数字信号,所以常把编码信道称为离散信道或数字信道。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】Once an Englishman named Jack Brown went to Russia for a holiday. He stayed there for several months and then came home again. Some of his friends visited him a few days after he got back. “I had a ve...
【简答题】A．He doesn't know Jack. B．He forgets to ask Jack. C．Jack knows a lot about digital camera. D．Jack probably knows nothing about digital camera.
【单选题】DNA复制、转录、翻译的原料、场所及遵循碱基互补配对原则依次分别为 ①脱氧核苷酸 ②核糖核苷酸 ③氨基酸 ④细胞核 ⑤细胞膜 ⑥核糖体 ⑦A与T配对、G与C配对 ⑧A与U配对、T与A配对、G与C配对 ⑨A与U配对、G与C配对 [ ]
A.
①②③、④④⑥、⑦⑧⑨
B.
②①③、④⑤⑥、⑦⑧⑨
C.
③②①、④⑤⑥、⑦⑨⑨
D.
①②③、④⑤⑥、⑦⑧⑨
【单选题】Jack to several places in North China since he came to Beijing with his parents .
A.
was traveling
B.
has traveled
C.
is traveling
D.
had traveled
【简答题】 指引线( )相交,可画为折线,允许折( )次。
【简答题】Jack hoped to come again soon． Jack hoped that he ______ again soon．
【多选题】关于芳香水剂的错误表述是
A.
芳香水剂系指芳香挥发性药物的饱和或近饱和水溶液
B.
芳香水剂系指芳香挥发性药物的稀水溶液
C.
芳香水剂系指芳香挥发性药物的稀乙醇的溶液
D.
芳香水剂不宜大量配制和久贮
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