问题
单项选择题
NO用于降低肺动脉高压的临床常用浓度是（）
A.1～5ppm
B.10～20ppm
C.20～40ppm
D.40～80ppm
E.80～10ppm
答案
参考答案：B
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NO用于降低肺动脉高压的临床常用浓度是（）
A.1～5ppm
B.10～20ppm
C.20～40ppm
D.40～80ppm
E.80～10ppm
参考答案：B
| Look and choose the proper sentences. 看图，选择合适的句子。 |
 1. ( ) |  2. ( ) |  3. ( ) |
 4. ( ) |  5. ( ) |  6. ( ) |
| A. An airplane is fast. B. — Mum, may I go on a trip to Beijing? — OK, Li Ming! You work hard in school. You may go. C. We go on a trip by train. D. Jenny and Danny arrive in Shijiazhuang on January 19th. E. I love to go on trips. F. Danny and Jenny leave Canada on January 18th. |