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【单选题】
变压器空载运行时,空载电流和主磁通的相位关系是( )。A.
空载电流超前主磁通一个铁损角
B.
空载电流滞后主磁通一个铁损角
C.
两者同相位
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举一反三
【简答题】In talking about the role of the U. N., the author says that frontiers of nations have lost their meanings because of____________.
【单选题】听力原文： A U. N. Security Council delegation travels to South Africa on the first stop of a nine - nation African tour aimed at bolstering peace efforts in the central Great Lakes region. The 12- member ...
A.
strengthening the ties between UN body and South Africa
B.
providing economic aid to South Africa
C.
monitoring comprehensive ceasefire agreement
D.
bolstering peace efforts in the central Great Lakes regions
【简答题】质量为 的小球,用轻绳 AB 、 BC 连接,如图所示。剪断绳 AB 前后的瞬间,绳 BC 中的张力比 。
【单选题】The middle tier of members in the proposed structural changes of the U. N. would ______.
A.
have a veto
B.
be permanent
C.
be elected again every four years
D.
comprise 9 members
【单选题】A member country cannot ally (结盟) itself with ______.
A.
other U. N. member countries
B.
other countries not members of the U. N.
C.
countries resisting openly the U. N.
D.
states against which the U. N. has ever taken preventive or enforcement action
【单选题】有关极量的错误描述是：
A.
出现最大的治疗作用，但尚未引起毒性反应
B.
极量又叫最大治疗量
C.
即治疗疾病时，允许使用的最高剂量
D.
病人用药时，非特殊情况一般不得超极量应用
E.
比中毒量小的量称为极量
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