Conjunctivitis may be caused by bacteria, viruses, allergens, or irritants. What signs and symptoms differentiate bacterial conjunctivitis from other types ？（）

A．Subacute onset, severe pain, and preauricular adenopathy.

B．Recurrent onset, no pain, and clear discharge.

C．Acute onset, moderate pain, and purulent discharge.

D．Acute onset, mild pain, and clear discharge.

在不影响总工期的前提下，本工作可以利用的机动时间是( )。

A．总时差
B．自由时差
C．间歇时间
D．搭接时间