互换机车或乘务组时,应进行减压50kPa的简略试验。
参考答案:错
After________ by the police for several days, the robber had to give in.
A.surrounding
B.surrounded
C.surround
D.being surrounded
国际检疫传染病不包括()。
A、霍乱
B、鼠疫
C、黄热病
D、艾滋病