【简答题】水准仪上圆水准器的作用是 ,管水准器的作用是 。
【简答题】管水准器的作用是 ,圆水准器的作用是 。
【判断题】精馏塔的全塔总效率不等于塔内各板的默弗里效率的平均值。
【简答题】水准仪圆水准器的作用是 ,管水准器的作用是 。
【判断题】水准仪上圆水准器的作用是使竖轴铅垂,管水准器的作用是使望远镜视准轴水平。()
【单选题】In the 1960s the West Coast became an important center for rock music. Los Angeles and Southern California are famous for sunshine and surfing. There, a quieter kind of rock called surf rock became fa...
【单选题】In the 1960s the West Coast became an important center for rock music. Los Angeles and Southern California are famous for sunshine and surfing. There, a quieter kind of rock called surf rock became fa...
【单选题】下列关于真菌说法错误的是
A.
它是真核生物,基本单位是菌丝,繁殖产生各种类型孢子
C.
真菌是异养生物,它可以寄生在其他植物上造成病害,所以危害很大,弊大于利。
D.
我们所看到的植物病害的絮状物可能是真菌的菌丝,分生孢子梗等。