相干检测
参考答案:
利用光波的振幅、频率、相位携带信息,而不是光强。因为用光波的相干原理,只能用相干光。类似于无线电外茶检测,故又称光外差检测。
副溶血弧菌引起的食物中毒,主要常见于()
A.我国沙漠地区
B.内陆沿海地区食海产品
C.草原地区
D.内陆平原地区
E.与地区没有关系
Mrs Black doesn't know if her American friend _____ to Heilongjiang. If he _____ here, she will meet him at
the airport. [ ]
A. will come; comes
B. will come; will come
C. comes; will come