问题
单项选择题
血中Hb含量低于多少时，即使重度缺氧，亦难发现发绀
A．<50g/L
B．<60g/L
C．<70g/L
D．<80g/L
E．<90g/L
答案
参考答案：B
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血中Hb含量低于多少时，即使重度缺氧，亦难发现发绀
A．<50g/L
B．<60g/L
C．<70g/L
D．<80g/L
E．<90g/L
参考答案：B
| 为下列问句选择合适的答语。 | |
| ( ) 1. Did you play football yesterday? ( ) 2. Did Daming listen to music? ( ) 3. What did you do on Saturday? ( ) 4. Did you and Amy help your mother? ( ) 5. Did Lingling phone Mary last night? ( ) 6. Was it a nice day? | A. No, she didn't. B. I walked in the park. C. No, he didn't. D. Yes, I did. E. No, we didn't. F. Yes, it was. |