Ongoing studies of insects, canopy trees, orchids, and amphibians show that coffee plantations are often critical refuges protecting forest species where there is no longer any forest.
A.
animals able to eat all kinds of food
B.
animals able to move a long distance
C.
animals able to stay on land and in air
D.
animals able to live on land and in water
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举一反三
【单选题】理想变压器的一次、二次绕组匝数比为4∶1,若在一次绕组上加u=1414 sin100πt V 的交流电压,则在二次绕组的两端用交流电压表测得的电压是