附着式自升塔式起重机在拆卸过程中,最后应留()塔身。
A.1组
B.2组
C.3组
D.4组
参考答案:C
The young man did nothing but ___ in the street like a spirit all day.
A.wander
B.to wander
C.wandering
D.to be wandering
发动机在热试时,冷却水温度应保持在()
A.75~85℃
B.80~95℃
C.90~100℃
D.65~75℃