单项选择题

速度线一旦被突破，其原来的支撑线变成压力线，而压力线则变成支撑线。

A.正确
B.错误

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多项选择题

Which of the following descriptions accounts for the different expressions “The cup is half full/The cup is half empty"
A、The perspective of observing the cup varies from person to person.
B、The meaning of full and empty is different.
C、There is no special reason for the two different expressions, and they are spoken purely by chance.
D、The two expressions reflect the way we perceive the world.

多项选择题

具有“置0” “置1” “保持” “翻转”功能的触发器叫（）
A、JK触发器
B、JK触发器
C、基本RS触发器
D、同步D触发器
E、同步RS触发器
F、钟控RS触发器
G、T触发器