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【简答题】
发光二极管两端加 电压,它会发光;发光二极管工作时通常要串联一个 。
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反馈参考答案：
举一反三
【单选题】Was it just a(n)______ that John and she had met at the market for three days running, or was he deliberately trying to seek her out?
A.
coincidence
B.
occasion
C.
incidence
D.
accident
【简答题】组合电路的特点是( )和( )
【简答题】完形填空 John and Mary had a nice home and two lovely children, a boy and a girl. John had a good __ 1 __ and had just been asked to go on a business trip to another city and it was __ 2 __ that Mary need...
【单选题】(2009.12) John had never been abroad before, ________ he found the business trip very exciting.
A.
because
B.
though
C.
so
D.
while
【简答题】完形填空 John and Mary had a nice home and two lovely children, a boy and a girl. John had a good _ 1 _ and had just been asked to go on a business trip to another city and it was _ 2 _ that Mary needed a...
【判断题】连续多日食用荔枝可引起荔枝病，发病时有饥饿感、头昏、无力、出冷汗、抽搐、瞳孔缩小、呼吸困难甚至死亡的症状，其实质是低血糖，荔枝中含有一种可降低血糖浓度的物质。
A.
正确
B.
错误
【单选题】Fortunately for John, he had a(n) ________ wife.
A.
understand
B.
understanding
C.
understood
D.
understandable
【简答题】组合电路的特点是（）；时序电路的特点是（）。
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