A:降低库内温度
B:促进库内气体流动
C:抑制呼吸作用
D:利于有机物消耗
What i____ happens is that a great number of things choose to go wrong at precisely the same moment.
给定下列函数:①y=x12 ②y=log12(x+1) ③y=x-1 ④y=2x-1,其中在区间(0,1)上单调递减的函数的序号是( )