因蓝藻的细胞中没有明显的(),所以称它为原核生物;其色素均匀的散步在周围的原生质中,

题型:填空题

问题:

因蓝藻的细胞中没有明显的(),所以称它为原核生物;其色素均匀的散步在周围的原生质中,也就是说它是一类有色素而没有()的藻类。

考点:生物学水生生物学水生生物学题库
题型:填空题

阅读短文,判断正(T)误(F)。

     A little girl often goes to a shop. In summer, she usually gets some ice cream. In spring winter and

autumn she asks for some chocolates (巧克力). The man in the shop knows her well. One day, it's

cold and windy. The snow is falling. The little girl goes into the shop and asks for some cigars(香烟).

The man says, "No, you can't ask for that. You are under 18. Look, a policeman is coming…

( )1. The girl wants ice cream all the time.                          

( )2. She doesn't like chocolates.                                    

( )3. The man in the shop doesn't know her.                          

( )4. One cold winter day, the girl goes to the shop for some cigars.

( )5. The girl says the policeman is her father.                      

题型:填空题

图案校正的过程()。

题型:填空题

硝酸镁可能的制备方程式是()。

A.MgO+H2O===Mg(OH)2

B.MgO+2HNO3===Mg(NO3)2+H2O

C.2Mg+O2===2MgO

D.Mg+O2===MgO2

题型:填空题

解决发射干扰的基本方法是增加发射端与接收端的隔离,增加隔离主要方法有:()。

A.提高发射端滤波器的性能

B.增加天线挂高

C.共站时使用隔离板

D.共站时采用天线空间隔离

题型:填空题

在PFD上,在右下角出现琥珀色的ILS闪亮时,表示:()

A、APPR(进近)方式预位而未选择ILS显示。

B、ILS信号丢失。

C、航向道偏差过大。

更多题库