男，63岁，农民。排尿不畅2年，近半年加重，且时有尿频尿急尿痛，口服抗生素有效，但易

      she likes chatting, she is careful about making friends with strangers online.

A．In order that

B．Even though

C．Unless

D．If

普通晶闸管控制极加正向电压则导通，加反向电压则截止。

α粒子与物质相互作用的形式主要有以下两种（）、电离和激发。

An oil exploration company has been contracted to dig 100 exploratory holes for $ 200000. The cost to complete this job is estimated to be $150000, but the company doesn’t recognize any of the $ 50000 profit until the job is completed. Which revenue recognition method is being used

A．

B．

C．

什么叫一次投料法？