从CT=0可以看出清零端是异步的，这个说法是否正确？<br/> <img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/5c42a3b8ac4646378db1c9bc368c82a6.jpeg?x-oss-process=image/sharpen,200"/>