清洗丝印网板时易出现事故：（）
A、印网板感光胶层失效
B、油墨烧伤皮肤
C、清洗剂溅入眼中，造成伤害
D、清洗剂烧伤皮肤
参考答案：C
不宜快速大量输液的疾病是（）。
A.慢性肾功能不全
B.老年性慢性支气管炎
C.小儿肺炎
D.缩窄性心包炎
E.急性胃肠
— When did you go to bed last night?
— Very late. I didn't go to bed _____ my father came back. [ ]
A. until
B. since
C. while
D. after
