皮皮学，免费搜题
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【单选题】
Fishing stake, the position of which frequently _____, exist in the area covered by this chart.A.
removed
B.
altered
C.
corrected
D.
Converted
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】与往复泵比较,说明螺杆泵的特点
A.
结构简单。零件总数为相同工作参数往复泵的55%，易损件总数为往复泵的17%。
B.
体积小、重量轻。重量为相同工作参数往复泵的20%。
C.
流量均匀，压力稳定，无脉动。
D.
衬套螺杆副的制造工艺较复杂，使用寿命低。
E.
启动困难，效率低（效率为50~70%）。
F.
螺杆泵不属于容积式泵。
【单选题】It happened without ___________________it . (事情在我不知不觉中发生了。)
A.
my aware of
B.
my being aware of
C.
be aware of
D.
my awareness
【简答题】熟石灰的化学成分为( )
【简答题】熟石灰的主要化学成分是Ca答案：OH2。
【多选题】与往复泵比较,说明螺杆泵的特点?
A.
结构简单零件总数为相同工作参数往复泵的55%，易损件总数为往复泵的17%
B.
体积小、重量轻重量为相同工作参数往复泵的20%
C.
流量均匀，压力稳定，无脉动
D.
衬套螺杆副的制造工艺较复杂，使用寿命低
【简答题】The teacher who did the most to encourage me was, as it happened, my aunt. She was Myrtle C. Manigault, the wife of my mother’s brother Bill. She taught in second grade at all-black Summer School in C...
【简答题】Reading comprehension. The teacher who did the most to encourage me was, as it happened, my aunt. She was Myrtle C. Manigault, the wife of my mother's brother Bill. She taught in second grade at all-b...
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