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【单选题】
断路器热稳定电流是指在( )时间内,各部件所能承受的热效应所对应的最大短路电流有效值。A.
0.5 秒;
B.
1 秒;
C.
5 秒;
D.
10 秒。
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皮皮学刷刷变学霸
举一反三
【单选题】During the Middle Ages, productivity of labor ______.
A.
was a primary concern of society
B.
was hampered by class relationships
C.
began to improve over levels reached by the Greeks
D.
was in a period of technical progress
【单选题】The box is ______ of all. [ ]
A.
heaviest
B.
the bigest
C.
the heavier
D.
the biggest
【简答题】基本文字符号有()与双字母符号两种。
【单选题】The bigest concern was about who would ____to his post after his retirement.
A.
succeed
B.
proceed
C.
concede
D.
exceed
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