对于外阴血肿的处理的描述下列哪项是正确的（）。 A.伤后5小时可行紫外线治疗 B.伤

I always help my sister _____ her history.

A．to

B．with

C．for

D．of

幼儿园教师吴某带领儿童去春游，一儿童失足掉入粪坑，吴用棍子试了试，坑深不足一米，吴嫌脏臭不愿下坑，此时又无他人帮助，致使该儿童被淹死，吴的行为构成_________。

A．构成故意杀人罪

B．构成遗弃罪

C．构成过失杀人罪

D．不构成犯罪

Windows为什么采用树形目录结构管理文件？

During a morning assessment, the nurse percusses tympany. The nurse understands that tympany is a loud, high-pitched, moderately long sound with a drumlike, musical quality that's most commonly heard over the

A．heart.

B．liver.

C．pancreas.

D．stomach.

为防止电焊弧光伤害眼睛，应采取的防护方式是使用（）

A、墨镜

B、滤光镜

C、平光镜

D、风镜