【单选题】The 1988 drought in North America was probably caused by shifts in the temperature patterns of large equatorial stretches of the Pacific Ocean. The drought, therefore, is not evidence for the hypothes...
A.
Most pre-1988 droughts for which we have records were preceded by shifts in temperature patterns in the Pacific Ocean.
B.
There has been no warming trend in the United States over the last 100 years.
C.
The consequences of global warming occur long after the actual emission of pollutants into the atmosphere.
D.
Emissions of carbon dioxide gas into the atmosphere increased in 1988.
E.
A global warming trend could cause increases in the frequency and severity of shifts in temperature patterns in the Pacific Ocean.
【单选题】当二极管的反向电压增加到某一数值时,反正电流急剧增加,此时的电压称为()。
【单选题】测风原始数据中的方位角指的是正北线与( )沿顺时针方向的夹角。
【多选题】下列关于亚急性硬化性全脑炎的叙述对的是:
【单选题】当二极管的反向电压增加到某一数值时,反正电流急剧增加,此时的电压称为()。
【多选题】下列关于亚急性硬化性全脑炎的叙述正确的是