CRH1型动车组在紧急情况下，可以使用逃生绳从（）逃生。
A、侧门
B、客室
C、司机室
D、乘务员室
参考答案：C
Peter received a letter just_____his grandma would come to see him soon.[ ]
A. said
B. says
C. saying
D. to say
锅炉受热面直管的长度偏差不应超过（）。
A.5mm
B.3mm
C.±3mm
D.±5mm
