计算:6tan230°-cos30°·tan60°-2sin45°+cos60°。
解:原式=。
—I have watched the film.
—When _____ you _____ it? [ ]
A. have, watched
B. do, watch
C. did, watch
D. will, watch
溃疡性结肠炎的治疗措施包括()
A.柳氮磺吡啶
B.硫唑嘌呤
C.手术治疗
D.洛赛克
E.肾上腺皮质激素