一把直尺的厚度大约是2请选择DCBA+J4\;Q6t*O5Y)r/e/p7e*n4K9j:C4[+R5G)?4^8c's'j/l7C7u)U-v0Y1Z
A：分米7e*n4K9j:C4[+R5G)?4^8c's'j/l7C7u)U-v0Y1Z
B：厘米7e*n4K9j:C4[+R5G)?4^8c's'j/l7C7u)U-v0Y1Z
C：毫米7e*n4K9j:C4[+R5G)?4^8c's'j/l7C7u)U-v0Y1Z
D：千米7e*n4K9j:C4[+R5G)?4^8c's'j/l7C7u)U-v0Y1Z