下列桥梁类型中，（）是一种在竖向荷载作用下无水平反力的结构。
A.拱式桥
B.上承式桥
C.梁式桥
D.高架桥
参考答案：C
变更车道时只需开启转向灯，便可迅速转向驶入相应的行车道。
— _____?
— Boil the noodles. [ ]
A. What should we do next
B. What did you have for breakfast
C. What do you think of the noodles
D. What's the matter
