—Do you know what time your uncle Hangzhou tomorrow?
—At 2∶00 p.m. I will meet him when he at the airport.
A:gets to; arrives
B:will get to; will arrive
C:will get to; arrives
D:gets to; will arrive
如图,平面直角坐标系中,已知直线y=x上一点P(1,1),C为y轴上一点,连接PC,线段PC绕点P顺时针旋转90°至线段PD,过点D作直线AB⊥x轴,垂足为B;直线AB与直线y=x交于点A,连接CD,直线CD与直线y=x交于点Q.
①检查装置的气密性 ②加入稀硫酸 ③加入锌粒 ④收集氢气
我国东南沿海厦门、汕头一带及台湾的骑楼图,往往从二楼起向街心方向延伸到人行道上。其主要目的是 ( )