为了延长药物作用时间可将药物制成
A. 糖衣片
B. 肠溶衣片
C. 泡腾片
D. 舌下片
E. 控缓释片
动车组列车制动初速度为250km/h时,紧急制动距离限值为()m。
A. 3200
B. 2800
C. 3600
Which of the following works was written by Robert Browning?
A. My Last Duchess
B. David Copperfield
C. An Ideal Husband
D. Under the Greenwood Tree
Canadas official national sport is______.
A. curling
B. skating
C. cricket
D. ice hockey