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【单选题】
下列说法不正确的是（ ）A. 只有大小相等且极性一致的电压源才允许并联。B. 只有大小相等且方向一致的电流源才允许并联。C. 理想电压源的输出电压为恒定值，而输出电流的大小由外电路决定。D. 理想电流源的输出电流为恒定值，而输出电压的大小由外电路决定。A.
A
B.
B
C.
C
D.
D
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举一反三
【单选题】My friend ( ) to visit the Great Wall, too.
A.
does not plan
B.
plan not
C.
not plans
D.
plans
【简答题】The (careful) ______ prepared plan turned out to be a great success.
【单选题】They finished the plan ______, and achieved great ______. [ ]
A.
successfully; successfully
B.
success; success
C.
successfully; success
D.
success; successfully.
【单选题】In the actual execution of the 'ownership society' plan ______.
A.
people showed great zeal
B.
people showed great expertise in handling their accounts
C.
most people diversified their portfolios
D.
this plan could hardly cover the Social Security payment of those currently approaching retirement (aged 55 to 64)
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