尖轨尖端应不低于基本轨顶面以下()mm,即不得使尖轨尖端位于轮缘下部,以免尖轨与基本轨偶有不密切时,逆向进岔的车轮轮缘有()危险。
参考答案:25 ;爬上尖轨的
链球菌感染后急性肾小球肾炎必有的临床表现是()。
A.肉眼血尿
B.镜下血尿
C.水肿
D.高血压
E.肾功能异常
In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel().
A.is holding course and speed
B.is turning to starboard
C.intends to pass port to port
D.will keep out of the way of the stand-on vessel