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【单选题】
锅炉燃油系统中,根据采用的喷油器不同,控制或调节燃烧方式也不同,描述错误的是 。A.
带回油式喷油器的燃烧器，喷油量是通过回油调节阀的开度调节
B.
压力式喷油器通常是控制喷油器回油电磁阀开或关，进行位式调节
C.
旋杯式喷油器是在喷油器进油管路上设调节阀，进行连续的比例调节
D.
蒸发式喷油器是左喷油器回油管路上设调节阀，进行连续的比例调节
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【简答题】Why did unemployment increase during the period discussed in the passage? [A] There are fewer jobs in summer. [B] Many companies had dismissed workers. [C] The labor force had grown. [D] Records have ...
【单选题】Why TI' practitioners are reluctant to accept independent testing?
A.
'They will not get financial benefits from the test.
B.
The reliability to the test is highly doubted.
C.
They believe the test is not in line with their practice.
D.
They do not want to disclose the truth to the public.
【单选题】According to paragraph 1, why is it impossible to identify the time period for theatres in Greece?
A.
There are too few sites that have been excavated and very little data collected about them.
B.
The archeologists from earlier periods were not careful, and many artifacts were broken.
C.
It is confusing because stones from early sites were used to build later structures.
D.
Because it is very difficult to date the concrete that was used in construction during early periods.
【单选题】Why did some TI' practitioners agree to be the subjects of Emily's experiment ?
A.
It involved nothing more than mere guessing.
B.
They thought it was going to be a lot of fun.
C.
It was more straightforward than other experiments.
D.
They sensed no harm in a little girl's experiment.
【单选题】Why did unemployment increase during the period discussed in the passage?
A.
There are fewer jobs in summer.
B.
Many companies had dismissed workers.
C.
The labor force had grown.
D.
Records have become more accurate (准确).
【单选题】阻止空气流入燃烧区域或用不燃物质冲淡空气,使燃烧物质得不到足够的氧气而熄灭火的方法是
A.
隔离灭火法
B.
窒息灭火法
C.
冷却灭火法
D.
抑制灭火法
E.
冷水灭火法
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