同型异质结
参考答案：
掺杂剂在冶金结处不变的异质结。
世界三大宗教指
①基督教②佛教③道教④伊斯兰教 [ ]
A．①②③
B．①③④
C．②③④
D．①②④
.It is said that if a mirror is broken for no reasons, bad luck is likely to strike, but I really __________ it.
A．doubt
B．believe
C．think
D．support
