A:图中共有5种碱基
B:图中共有6种核苷酸
C:图中的过程遵循碱基互补配对原则
D:图中过程不需要消耗能量
—How many ________ are there on the table?
—Three. Are you thirsty? Let's cut one and eat it.
读图,回答下列问题:
165+202≈____
310+590≈____