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某多肽的化学式为C53H66O19N10,将它彻底水解得到三种氨基酸:甘氨酸(C2H5NO2),苯丙氨酸(C9H11NO2),谷氨酸(C5H9NO4)则此多肽中有肽键数为
11个月前
Checking your answers before handing in your paper can help you ________ mistakes.
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This ______ ______ (听上去像) my school in China.
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-I sent him a most interesting story book by mail this morning.
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已知函数f(x)=1\3x^3-mx^2-3m^2x+1在区间(1,2)内是增函数,则实数m 的取值范围是?
1年前