【简答题】20欧姆和30欧姆两个电阻并联接到60V的电源上,电路中的总电流是多少?两个电阻上电流各是多少?
【简答题】某地一年内发生 起交通事故的概率为 ,其中 是常数,求当地一年内至少发生一起交通事故的概率
【单选题】The terms of trade deteriorate in devaluing country because __________.
A.
the same quantity of exports brings back fewer foreign goods
B.
the prices of exports expressed in foreign currency are lower than before
C.
the same quantity of foreign goods can be exchanged for more domestic goods
【多选题】在下列基督教堂中,为我国新教教堂的是()