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继电器用来构成 ，用继电器接点可构成各种信号控制电路，将信号机、转辙机、轨道电路等有机的连接起来，完成严密的联锁关系。 A. 逻辑关系
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举一反三
【单选题】He was eager to go to the hospital to see his stepmother,______ he loved and respected as his own mother.
A.
as
B.
which
C.
/
D.
whom
【单选题】Which of the following can be learned from the passage?
A.
The Hope Foundation couldn’t help the woman.
B.
The police are determined to find the mother.
C.
The mother gave up her baby because she was homeless.
D.
The mother was eager to hide her identity.
【简答题】For this question, assume that taxes are independent of income (i.e., the income tax rate is zero). Now suppose that fiscal policy makers wish to decrease equilibrium output by $500 billion. Further s...
【单选题】(单项选择题)具有下列()情形的,应当由所在地旅游主管部门给予撤销导游证。
A.
导游死亡的
B.
取得导游证后出现无民事行为能力或者限制行为能力
C.
申请人以欺骗、贿赂等不正当手段取得导游证的
D.
导游证有效期届满未申请换发导游证的
【单选题】It's strange that he should refuse a job in government ______ a university appointment.
A.
in favor of
B.
at an advantage of
C.
in charge of
D.
in excess of
【单选题】In Kaus' opinion______.
A.
the government should strive to realize equality in everybody's income
B.
the government should do its best to bring every American into the middle class
C.
the goal will be easier to attain if we change it from money equality to civic equality
D.
It's almost impossible for the government to provide such things as national health care, improved public schools, universal national service, etc.
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