流行性腮腺炎病毒不能母婴垂直传播。
参考答案:错
---Where is Zhang Ming?
---Oh, don’t you know he to Beijing to see his parents and he’ll be back tomorrow.
A. has gone B. has been C. had gone
拱桥施工最常用的拱架是()。
A、木拱架
B、钢拱架
C、竹拱架
D、土牛胎拱