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供电系统的频率偏差允许值为 0.2Hz,系统频率通常由电力系统决定和调整,用户供电系统一般不必采取稳频措施A.
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B.
错误
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【单选题】---Where are your parents? ---They are in the kitchen, they ______the dinner for the party the whole day.
A.
are preparing
B.
have been prepared
C.
have been preparing
D.
were preparing
【简答题】Want to be perfect at a holiday dinner party? Follow these tips on good manners, and your dinner companions are sure to be thankful. *Arrive no earlier than the time the host has announced and no late...
【单选题】根据《中华人民共和国文物保护法》，关于文物保护单位保护范围及建设控制地带内不得进行活动有关规定的说法，错误的是()。
A.
无特殊情况，文物保护单位的保护范围内不得进行爆破、钻探、挖掘等作业
B.
在文物保护单位保护范围和建设控制地带内，对已有的污染文物保护单位及其环 境的设施，应当限期治理
C.
因特殊情况需要在全国重点文物保护单位的保护范围内进行爆破、钴探、挖掘等作业 的，需经国务院文物行政部门批准
D.
在文物保护单位保护范围和建设控制地带内，不得建设污染文物保护保护单位及其环 境的设施，不得进行可能影响文物保护单位安全及其环境的活动
【单选题】— Why did the dinner party start so late last night? — It was _____ that caused him to serve dinner an hour later than usual.
A.
we were late
B.
we being late
C.
our being late
D.
because we were late
【单选题】(The) famous scientist, (in his honor) a dinner party (will be held) tonight, (is to) arrive soon..
A.
The
B.
in his honor
C.
will be held
D.
is to
【简答题】下列所得一次收入畸高的，可以实行加成征收个人所得税的有（ ）。
【单选题】A molecule is made of ____, for example, a water molecule contains two hydrogens and one oxygen.
A.
electrons
B.
neutrons
C.
protons
D.
atoms
【简答题】Harry was behaving very (child)______ at the dinner party last night.
【单选题】When water surrounds a hydrophobic molecule, the optimal arrangement of hydrogen bonds results in a highly structured shell, or _________ layer, of water around the molecule.
A.
hydrophobic
B.
solvent
C.
solvation
D.
organic solvent
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