石油的粘度随温度的升高而升高。
参考答案：错
解析：石油的粘度随温度的升高而降低。
I________ along the street looking for a place to park when the accident________ . [ ]
A. went; was occurring
B. went; was occurred
C. was going; occurred
D. was going; had occurred
BPDU是（）。
A.单播帧
B.组播帧
C.广播帧
