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【单选题】
三相半控Y形调压电路可以简化线路,降低成本。但电路中( ),将产生与电动机基波转矩相反的转矩,使电动机输出转矩减小,效率降低,仅用于小容量调速系统。 A.无奇次谐波有偶次谐波 B.有偶次谐波 C.有奇次谐波外还有偶次谐波 D.有奇次谐波无偶次谐波A.
B.
C.
D.
D
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【简答题】电子控制柴油机喷射系统根据其产生高压燃油机构的不同，可分为（）喷射系统、电子控制泵喷嘴喷射系统、（）喷射系统。
【单选题】Who has bought chocolate for their mother?
A.
Stanley.
B.
Stanley and Emily.
C.
Emily.
【单选题】A mother who ________ her son will do everything for his happiness.
A.
is loving
B.
loves
C.
loved
D.
has loved
【单选题】根据柴油机喷油泵的油量调节机构固定的位置不同，速度特性可分为（）。 a．额定外特性； b．超负荷速度特性； c．部分外特性； d．推进特性； e．限制特性。
A.
a～d
B.
a～e
C.
a～c
D.
b～e
【单选题】A mother who ___ here son will do everything for his happiness.
A.
is loving
B.
loves
C.
loved
D.
has loved
【单选题】Who has bought chocolate for their mother?
A.
Stanley.
B.
Emily.
C.
Stanley and Emily.
【多选题】For a mother who has young baby, ____ are more attractive when she choose a job.
A.
flexible working time
B.
parental leave
C.
good pension
D.
impressive job title
【单选题】A newborn infant of a mother who has human immunodeficiency virus (HIV) infection is tested for the presence of HIV antibodies. An enzyme-linked immunosorbent assay (ELISA) is performed, and the resul...
A.
Positive for HIV
B.
Indicates the presence of maternal infection
C.
Indicates that the newborn will develop acquired immunodeficiency syndrome (AIDS) later in life
D.
Positive for AIDS
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