羊疥螨主要寄生于()
A.表皮
B.小肠
C.毛囊腺
D.肝脏
E.皮脂腺
参考答案:A
not to miss the flight at 15:20, the manager set out for the airport in a hurry.[ ]
A. Reminding
B. To remind
C. Reminded
D. Having reminded
膨胀机的密封气通过轴承箱的差压过低,会使膨胀机紧急停车。