经皮CO2分压监测(TcCO2)
参考答案：经皮CO2分压监测(TcCO2)：属非创伤性监测方法，能反映病情变化动态，指导用药，及调整呼吸机参数。
—Could you tell me_______?
—Sorry, I don't know. I was not at the meeting. [ ]
A. what does he say at the meeting
B. what did he say at the meeting
C. what he says at the meeting
D. what he said at the meeting
把质量为0.5kg的石块从10m高处以300角斜向上抛出，初速度是v0=5m/s。不计空气阻力（g取10m/s2），石块落地的速度多大（ ）
