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【单选题】
直流电动机按励磁方式可分为（）种类型。A.
2
B.
3
C.
4
D.
5
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举一反三
【单选题】Why didn’t they drive the bear away?
A.
Because the bear was too big.
B.
Because it was dangerous to drive a bear away.
C.
Because the bear ate everything they had.
D.
Because they wanted to play with the bear.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could build devices to trap insects. D．They could protect the plants from severe droughts.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could make the plants grow faster. D．They could build devices to trap insects.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could make the plants grow faster. D．They could build devices to trap insects.
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