【单选题】柴油机气缸套产生拉缸工艺上的原因是___________是造成。 1.润滑不良2.工作表面的粗糙度低3.超负荷4.气缸套内圆表面圆度误差过大5.活塞运动装置对中性差
【单选题】When will the man 's flight leave?
【简答题】Flight AF033 leave Paris at 12:30 on Tuesday,12th December and arrives in Montreal at 13:55 on the same day.What is the total transport time?
【单选题】John _______ for London this afternoon and his flight _______ off at 18:20.
A.
is about to leave; will take
C.
is going to leave; is taking
D.
is to leave; is about to take
【单选题】At what time does the flight to London leave?