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同步触发器使用时必须保证R/S 至少有一个为“ ”,即必须满足 的条件,这个条件也称为基本RS触发器输入信号的约束条件。
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举一反三
【简答题】These sentences are about the reading. Complete them with the target words and phrases in the box.
【多选题】Which of these sentences are true about cloud seeding, according to the passage?
A.
China carries out more cloud seeding than anywhere else.
B.
Cloud seeding is too expensive for most countries.
C.
Cloud seeding is mostly done for scientific rather than economic reasons.
D.
Cloud seeding helps turn dry areas of land into agricultural areas.
E.
Cloud seeding may affect the distribution of rainfall.
【简答题】These sentences are about the reading. Complete them with the target words and phrases in the box.
【简答题】These sentences are about the reading. Complete them with the target words and phrases in the box.
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