一张软盘在格式化后，盘上的目录情况是（）。 A.只保留了目录，没有文件 B.只有根目

实验室有一瓶食盐水和一瓶硬水，请加以区分（请说出实验操作方法、现象和结论）？

操作 ______；

现象和结论 ______．

My aunt meets me _____ 9 o'clock.[ ]

A. at

B. in

C. on

新股定价发行按价格优先、同等价位时间优先原则确定认购成功者。( )

A preschool-age child with sickle cell anemia is admitted to the health care facility in vaso-occlusive crisis after developing a fever and joint pain. What is the nurse's highest priority when caring for this child

A．Providing fluids.

B．Maintaining protective isolation.

C．Applying cool compresses to affected joints.

D．Administering antipyretics, as prescribed.

小提琴音色优美，音域宽广，表现力强，在乐器中占有显著的地位，被誉为“乐器王后”，这种乐器起源于哪里？（）

A、阿拉伯

B、维也纳

C、波士顿