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【简答题】
溢流阀为 压力控制，阀口常 ，先导阀弹簧腔的泄漏油与阀的出口相通。减压阀为 压力控制，阀口常 ，先导阀弹簧腔的泄漏油必须 。（进口；闭；出口；开；单独引回油箱）
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【单选题】The cellphone, a device we have lived with for more than a decade, offers a good example of a popular technology's unforeseen side effects. More than one billion are【1】use around the world, and when a...
A.
of
B.
for
C.
in
D.
by
【单选题】The cellphone, a device we have lived with for more than a decade, offers a good example of a popular technology's unforeseen side effects. More than one billion are (1)_____ use around the world, and...
A.
of
B.
for
C.
in
D.
by
【单选题】Which seems to be most significant in telling time to people of pre-industrial societies?
A.
Clock-work.
B.
The sun and the moon.
C.
Unpunctuality.
D.
Changes of season.
【简答题】形成良好班集体的重要标志是( )。 A.核心队伍 B.班级秩序 C.舆论班风 D.组织活动
【单选题】If you copy the online information onto your PC device, you will ______ .
A.
save the time of connecting to the online system
B.
reduce the risk of losing information
C.
pay just local telephone charges
D.
get local information only
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