Suppose A itself is the unit vector in the y direction B Then A dot B is what?

假设A是y方向上的,单位矢量,则是z方向上的单位矢量。，and，B，is，the，unit，vector，in，the，z，direction。,那A点B是多少呢？

youdao

B: Not very long. I arrived here on the dot.

对不起，我迟到了。你到这儿很长时间了吗。

youdao

Duck Hepatitis B Virus(DHBV) was tested in duck serum in Lanzhou area by DNA dot blot hybridization.

用血清斑点分子杂交法检测兰州地区饲养的鸭群。

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