He shouted to them ___________ the top of his voice but wasn’t heard.
A.
on
B.
of
C.
at
D.
from
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参考答案:
举一反三
【单选题】When using the branch current method to solve a complex circuit with b branches and n nodes (b > n), the loop voltage equation that can be writen is用支路电流法求解一个具有b条支路,n个节点(b>n)的复杂电路时,可以列出的( )个回路电压方程。
【单选题】When paralleling two alternators using three synchronizing lamps, the flickering of all three lamps becomes progressively slower. This means the_______.
A.
frequency of the incoming generator is approaching that of the bus
B.
frequency of the incoming alternator is less than that of the bus
C.
phase rotation of the incoming alternators is opposite to that of the bus
D.
terminal voltage of the incoming alternator is approaching that of the bus