C、C++:
机械臂DH参数结构体`rm_dh_t`

类成员变量说明

d
unit: m
C++
```
float rm_dh_t::d[8]
```
a
unit: m
C++
```
float rm_dh_t::a[8]
```
alpha
unit: °
C++
```
float rm_dh_t::alpha[8]
```
offset
unit: °
C++
```
float rm_dh_t::offset[8]
```