集合p={x|y=x-1}，集合Q={y|y=x-1}则P与Q的关系是（ ） A．

急性肾衰竭恢复期的标准以下哪项是错误的（）

A.肾功能正常

B.血肌酐逐渐恢复正常

C.尿量恢复正常

D.血尿素氮逐渐恢复正常

E.肾浓缩功能需要数月才能恢复正常

某种商品的进货价为每件x元，先按成本价提高30%，再按8折降价销售，售价为120元，则可列方程为______．

Microwave communication uses high-frequency (71) waves that travel in straightlines throughthe air. Because the waves cannot (72) with the curvature of the earth, they can be (73) only over short distance. Thus, microwave is a good (74) for sendingdata between buildings ina city or on a large college campus. For longer distances, the wavesmust be relayed by means of"dishes" or (75) . These can be installed on towers, highbuildings, and mountain tops.

A．optical

B．radio

C．electrical

D．magnetic

通过读秀的什么功能，可以对所需文字进行编辑（）。

A、文字下载

B、文字摘录

C、文字筛选

D、文字剪切

洛阳素有“九朝古都”之称，从中国第一个王朝－夏朝起，先后有（）个王朝在此设国都。

A.11

B.12

C.13

D.14