写出近义词
隐蔽—____ 前进—____ 发觉—____
小明得了肺炎,医生将抗生素从他前臂静脉输入,当运送到肺时,抗生素经过的途径依次是( )
①肺动脉 ②肺静脉 ③上腔静脉 ④下腔静脉 ⑤右心房 ⑥左心房 ⑦右心室⑧肺部毛细血管.
一次函数y=2x+3的图象沿y轴向下平移2个单位,所得图象的函数解析式是( )
-Jeff seems unhappy. What's the matter?
-He got his bike lost this afternoon. Let's go to __________ him __________.