【简答题】人类23对染色体分为____个组,其中X染色体属于____组,Y染色体属于____组。
【单选题】应用软件系统维护的类型有:完善性维护、适应性维护、改正性维护和()。
【单选题】When a supplier's shipments start arriving _____late, incomplete or damaged, it's time to consider looking for a new one.
【单选题】应用软件系统维护的类型有:完善性维护、正确性维护、适应性维护和( )。
【单选题】珍珠的形成过程说明在创业的过程中需要( )
【单选题】When the passion and drive ebb, ______.
A.
it's time to show the importance of one's full energy
B.
it's hard to move on again
C.
it's time to test one's work ability
D.
it's likely that high-level person won't give up