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【多选题】
多个电阻并联时,以下特性正确的是( )。A.
总电阻为各分电阻倒数之和
B.
总电压为各分电压之和
C.
总电流为各分支电流之和
D.
总消耗功率为各分电阻的消耗功率之和
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举一反三
【单选题】Which of the following is FALSE?
A.
Taobao has been more successful in e-commerce.
B.
Compared to chain stores, mom-and-pop stores like Taobao have no dvantages.
C.
eBay's Chinese market was terminated in 2006.
D.
The model that Taobao uses is copied from eBay.
【单选题】What is the passage mainly about?
A.
How to stage anti-smoking campaigns.
B.
The effects of the report on smoking and health.
C.
Tax as the surest path to cut smoking.
D.
The efforts to cut down on teenage smoking.
【单选题】Campaigns to stop the spread of SARS must continue to be _________ at the whole population.
A.
controlled
B.
specialized
C.
goaled
D.
targeted
【单选题】Which of the following is true?
A.
All grown-ups must sleep.
B.
Most grown-ups sleep for seven or eight hours.
C.
Few grown-ups need only five hours or less to sleep.
D.
Grown-ups usually sleep less than ten hours.
【简答题】Which benefit is guaranteed?
【简答题】Which statement is NOT true?
【单选题】An important step in fighting any electrical fire is to ______.
A.
stop ventilation
B.
stop the vessel
C.
de-energize the circuit
D.
apply water to extinguish the fire
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