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1956年,H.Fraenkel Conrat用炯草花叶病毒所进行的拆分与重建实验,结果也证明DNA是遗传物质的基础。
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It is known that solar power can ______ electric energy.
A.convert into
B.convert to
C.be converted into
D.be converted to
AWhen each time he Bcame to Beijing Con business, he Dwould call on me.
A.build up
B.make up
C.stand for
D.con to
一个LTI系统,其h[n]=anε[n],-1<a<1。输入x[n]=con(2πn/N),N=4,求系统响应。
A.BCPQRST
B.BCDEFG
C.BCDEFEF
D.BCDEF
A.BCDEF
B. BCDEFG
C. BCPQRST
D. BCDEFEF