【单选题】Dr. Jones ordered______ for the laboratory .
B.
two pieces of equipment
C.
two pieces of equipments
【简答题】不管怎么说,你应该写完信以后再跟着打个电话。(follow up)
【单选题】The sales manager asked to be______of everything concerning the sales in time.
【单选题】Dr. Jones ordered ______ for the laboratory.
B.
two pieces of equipments
C.
two pieces of equipment
【简答题】不管怎么说,你应该写完信以后再跟着打个电话。
【单选题】棘轮机构和槽轮机构中,当主动件做连续运动时,从动件随着做周期性的( )运动。
【单选题】Dr. Jones ordered_______ for the laboratory.
B.
two pieces of equipments
C.
two pieces of equipment
D.
two piece of equipments
【单选题】棘轮机构和槽轮机构中,当主动件做连续运动时,从动件随着做周期性的( )运动。
【单选题】棘轮机构中主动件做( ),从动件做间歇运动。