Merge branch 'lab7' into 'master'

在测试电路中添加信号源 See merge request !2

Merge branch 'lab7' into 'master'
6a0cfd4a · 李川 · 9225788e · 38b8f292 · 6a0cfd4a · 6a0cfd4a
--- a/74LS151.dlsche
+++ b/74LS151.dlsche
--- a/74LS151.dlsche.svg
+++ b/74LS151.dlsche.svg