科技是把____。
—I will have an important test tomorrow. I feel stressed now.—__________ and believe youself. You will pass it.
已知x,y满足约束条件{y≤0x+y+5≥0x-y≤0则z=2x+4y的最小值是( )
数笔画填空。
“互”共有____笔,第3笔是 ____。
“洗”共有____笔,第9笔是 ____。
“俩”共有____笔,第5笔是 ____。