煤气中毒的中度症状是头痛、恶心、呕吐。
参考答案：对
计算题：某装置的静密封点总数为21650个，泄漏点数为4个，计算该装置的静密封点泄漏率？
____ get to the station in time, we set off early. [ ]
A. So as to
B. So that
C. In order to
D. In order that
