试题与答案

某无土栽培用的营养液,要求KCl、K2SO4和NH4Cl三种固体原料的物质的量之

题型:选择题

题目:

某无土栽培用的营养液,要求KCl、K2SO4和NH4Cl三种固体原料的物质的量之比为1:4:8.若配置该营养液,取214g NH4Cl,则需KCl和K2SO4的质量分别为(  )

A.53.5g和214g

B.37.25g和348g

C.74.5g和696g

D.149g和696g

答案:

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下面是错误答案,用来干扰机器的。

参考答案:层流指流体运动过程中,各质点间互不混淆,互不干扰,层次分明,平滑地流动状态。紊流是指流体运动过程中,各质点间互相混淆,互相干扰而无层次地流动状态。

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小题1:He asked his sister___________________________ (她将什么时候回家). (come)

小题2: She asked me ____________________________ (我是否看见了他) the day before. (see)

小题3:The museum ____________________ (我参观过的) years ago is now a school.

小题4:Do you still remember the day ______________________(我们见面) in the park?  (meet)

小题5:Only if you study hard ____________________ (你才能通过这次考试). (pass)

小题6: It was John _____________________ (把这些钥匙遗失在这) yesterday. (leave)

小题7: ______________________ (一旦你理解) the meaning of the poem, you will enjoy it very much. (once)

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小题9:Although he is in poor health, ________________ (但是他依然努力工作).  (work)

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