小脑幕切迹疝和枕骨大孔疝的主要鉴别点是()
A.早期意识障碍且逐渐加重
B.去脑强直发作
C.病变对侧半身瘫痪
D.早期出现呼吸循环障碍
E.一侧瞳孔散大
参考答案:D
—Jim, do you have a PC?
—Yes, I _____ it for almost a year. [ ]
A. have bought
B. has bought
C. have had
D. has had
纸张的白度会直接影响彩色复制品的()效果。