心包穿刺抽液时第1次抽液不超过500mL。
参考答案:错
—Would you like to go fishing with me?
—_______, but I'm very busy at present. [ ]
A. I' d love to
B. I think so
C. I'm afraid not
D. I hope not
用两个相交的剖切平面剖开机件的方法制图称(),用几个相互平行的剖切面剖开机件的方法制图称()。