若点P(a-2,a+2)在y轴上,则a=______.
∵点P(a-2,a+2)在y轴上,
∴a-2=0,即a=2.故填2.
_______ passion, people won't have the motivation or the joy necessary for creative thinking. [ ]
A. For
B. Without
C. Beneath
D. By
YB55型小盒透明纸包装机中已完成透明纸包装的合格烟包在双联推包器的作用下从本机推送到YB65条盒包装机。