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【单选题】
在主机遥控系统中,换向的必备条件是______。A.
低于发火转速
B.
与转向不一致
C.
和凸轮轴位置不一致
D.
顶升机构抬起
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【单选题】She is a hardworking student, and all her spare time she has ________ staying in the library.
A.
spent
B.
is spent
C.
to spend
D.
to be spent
【简答题】A．She spent most of her time under the sea. B．She spent most of her time lying in the sun. C．She spent most of her time looking for sunken treasure. D．She spent most of her time taking photographs of ...
【简答题】Before she went abroad she spent as much time as she could ________ English. [A] practise to speak [B] practising speaking [C] practise speaking [D] to practise speaking
【单选题】关于量具的选择以下说法错误的是:
A.
单件小批生产应广泛采用通用量具，如游标卡尺、百分表和千分尺。
B.
大批大量生产应采用极限量块和高效的专用检验夹具和量仪等。
C.
大批大量生产应采用通用量具。
D.
量具的精度必须与加工精度相适应。
【简答题】A．She spent most of her time under the sea. B．She spent most of her time lying in the sun. C．She Spent most of her time looking for sunken treasure. D．She spent most of her time taking photographs of ...
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