The American education is compulsory for children aging from 5 to 18.
查看答案
US has two-year college.
A. 对
B. 错
MIT is a private research university located at Cambrige, UK.
A. 对
B. 错
循环系统疾病引起咯血的常见原因是（ ）
A. 心包炎
B. 肺梗塞
C. 风湿性心脏病二尖瓣狭窄
D. 右心衰竭
每天咯血量为多少时属于大量咯血（ ）
A. >100ml
B. >500ml
C. 100ml--500ml
D. >1000ml
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