肺栓塞最常见的咯血类型为
A.痰中带血
B.铁锈色血痰
C.黏稠暗红色血痰
D.整口鲜血痰
E.脓血痰
参考答案:D
点P(a+b,2a-b)与点Q(-2,-3)关于x轴对称,则a+b=______.
–Is Miss Green in the office? --No, she ____ to the library.
A.goes
B.had goes
C.has gone
D.would go