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【简答题】
定积分换元法（凑微分法）在实施换，积分上下限也要跟着（ ）.
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皮皮学刷刷变学霸
举一反三
【单选题】In prokaryotic cells the DNA is ______.
A.
found in the nucleus
B.
organized into a number of discrete chromosomes
C.
condensed into an unbounded area called the nucleoid
D.
condensed into nucleoli
E.
enclosed in a nuclear envelope
【单选题】Which is a feature of all prokaryotic cells?
A.
absence of cell surface membrane
B.
division by mitosis
C.
presence of cellulose cell wall
D.
presence of ribosomes
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