“激光是电磁波,激光与生物组织的作用实质上是电磁场与生物组织的作用”属于()
A.热作用
B.压强作用
C.光化作用
D.电磁作用
E.生物刺激作用
参考答案:D
食品卫生检测所采样品是()
A.大米
B.水
C.空气
D.血液
E.土壤
—In our English study reading is more important than speaking, I think.
—I don't agree. Speaking is ______ reading. [ ]
A. as important as
B. so important as
C. the most important
D. not as important as