新造25T型客车上线运行前,须进行通电、带载试运行,试运行距离原则上不得少于()。
A.500km
B.1000km
C.1500km
D.2000km
参考答案:B
We are all for your proposal that the discussion ______.
A.be put off
B.was put off
C.should put off
D.is to put off
上消化道大出血最常见的病因是
A.糜烂性出血性胃炎
B.食管贲门黏膜撕裂征
C.消化性溃疡
D.肝硬化食管静脉曲张破裂
E.胃癌