金刚石是共价晶体。
参考答案:对
One thousand people died in the disaster, two hundred and fifty-five children ____.
A.were included
B.including
C.include
D.included
咯血不见于()
A.支气管内膜结核
B.支气管肺癌
C.支气管哮喘
D.慢性支气管炎
E.支气管结石