下面O2和CO2的自述中,与物理性质有关的是 [ ]
A.O2为可燃物助燃
B.CO2用作人工降雨
C.O2使潮湿的钢铁腐蚀
D.CO2在光合作用中作原料
答案:B
In the United States, there is always ____ flow of people to areas of ____ country where more jobs can be
found. [ ]
A. a; the
B. the; a
C. the; the
D. a; a
某女性患者,56岁,60kg,拟喉罩通气全麻下行左眼眶肿瘤切除术。
哪项术前检查对麻醉意义最大()
A.查体温
B.尿液分析
C.咽喉检查
D.脑电图检查
E.血液流变学检查