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【单选题】
某电路中有 n = 4 个结点和 b = 7 条支路,用支路电流法列方程求解电路时,需要对结点和回路列出的 KCL 、 KVL 方程的个数分别是 ( ) 。A.
3个和3个
B.
3个和4个
C.
4个和3个
D.
4个和4个
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反馈参考答案：
举一反三
【简答题】根据车轮制动器中旋转元件的不同,车轮制动器可分为 、 。
【单选题】The man breathed a sigh of ______ when he was told that everything had arrived in good condition.
A.
sequence
B.
relief
C.
contradiction
D.
comparison
【单选题】The spectators breathed a sigh of relief when __________.
A.
the whistle has blown
B.
the referee blows the whistle
C.
they heard the final whistle
D.
the whistle blows
【单选题】We all breathed a sigh of relief when the news came _____ no one was injured in the accident.
A.
why
B.
that
C.
whether
D.
which
【单选题】She breathed a sigh of ______ when she found out she had passed the exams.
A.
relief
B.
belief
C.
delight
D.
relaxation
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