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【简答题】
)SDH中STM—1的速率是 Mb/s。
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皮皮学刷刷变学霸
举一反三
【单选题】关于电力变压器的安装，下列说法错误的是（ ）。
A.
变压器各部件及本体的固定必须牢固
B.
在不接地的lokV系统中，变压器的接地一般是其低压绕组中性点、外壳及其阀型避雷器三者共用的接地
C.
10kV变压器壳体距门不应小于0．8m，距墙不应小于1m
D.
采用自然通风时，变压器室地面应高出室外地面1．1m
【单选题】According to the last paragraph , development of education
A.
results directly from competitive environments.
B.
does not depend on economic performance.
C.
follows improved productivity.
D.
cannot afford political changes.
【单选题】According to the writer, the Government's policy on physical education
A.
should not promote team games at all
B.
upholds the principles of the Olympic Games
C.
can produce successful Marathon participants
D.
should encourage those qualities pursued by Marathon participants
【简答题】图中细双点划线表示 _ _ _ _ _ _ _ _ ,系 _ _ _ _ _ _ _ 画 法;
【单选题】绘制中纵剖面图时,位于中线面和舷侧之间的构件一般在图中用()画法表示,即用细双点划线表示这些构件可见轮廓的投影,用细虚线表示构件这些构件不可见轮廓的投影。
A.
投影
B.
假想
C.
重叠
D.
剖切
【单选题】It is suggested in the fourth paragraph that comprehensive sex education
A.
does not put off sexual activity among the teens.
B.
helps the teens reduce the risk of becoming pregnant by 50%.
C.
helps 50% of the teens avoid the sexual behavior.
D.
helps the teens avoid becoming pregnant more effectively.
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