增值税的计税方法，包括（）。
A、简易办法征收
B、简易计税方法
C、销项减进项
D、一般计税方法
参考答案：B, D
深二度烧伤的愈合时间，在无感染的情况下，一般为
A．5天
B．2周
C．2月
D．3～4周
E．植皮后才能愈合
An engineer designed a ball so that when it was dropped, it rose with each bounce exactly one-half as high as it had fallen. The engineer dropped the ball from a 16-meter platform and caught it after it had traveled 46.5 meters. How many times did the ball bounce ？（）
A. 5
B. 6
C. 7
D. 8
E. 9
