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【判断题】
离心泵主轴上装有轴套，作用是对轮定位和保护主轴，防止填料或水中杂质磨损。A.
正确
B.
错误
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】He remains __________ about the results of the examination, and feels reluctant to accept it.
A.
confident
B.
skeptical
C.
surprised
D.
Sensational
【单选题】He remains______about the results of the examination, and feels reluctant to accept it.
A.
confident
B.
skeptical
C.
surprised
D.
sensational
【简答题】赋值运算的左边必须是 ______
【简答题】Directions： Fill in the blanks with the words you have learned in this unit with the help of the first letter(s). Use only ONE word to fill in each blank. Write down the full spelling of the words ple...
【简答题】下图所示梯形图并调试,Y0线圈延时 S 得电。
【简答题】赋值运算的左边必须是 。
【单选题】I have closely watched my generation, known as The Millennials, for 29 years now. Joel Stein wrote an extensive piece on Millennials and he remains rather optimistic about our potential. I hesitate to...
A.
They show little interest in entertainment.
B.
They are not confident about their ability.
C.
They enjoy an easy life due to high technology.
D.
They may not have bright prospects for success.
【简答题】赋值运算符的左边必须是 。
【单选题】以下关于 气流组织方式的确定原则中,错误的是( )。
A.
送风口应尽量接近并经过人员工作地点，再经污染区排至室外。
B.
排风口尽量靠近有害物源或有害物浓度高的区域，以利于把有害物迅速从室内排出。
C.
尽量与原有空气运动方向相反，以利通风排风。
D.
在整个通风房间内，尽量使进风气流均匀分布，减少涡流，避免有害物质在局部地区积聚。
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