Which of the following would the nurse expect to include in a community health program designed to control sexually transmitted diseases (STDs)

A. Mass screening of all individuals.
B. Location of the possible sources of infection.
C. Treatment of those with the disease.
D. Isolation of those suspected of having STDs.

调度作业图表中“ZS”表示（）。

A.烧结车

B.铁水罐车

C.钢渣罐车

D.铁渣罐车