中国电信目前有天翼、号码百事通、商务领航三款套餐体系。
参考答案:错
The great invention he made ___ of great benefit to the whole world.[ ]
A. is proved
B. has proved
C. has been proved
D. is proved to be
尿布性皮炎患儿用灯光照射时,灯泡距臀部患处约为()
A.25cm
B.30cm
C.35cm
D.40cm
E.45cm