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【单选题】
在CO与Fe 2 O 3 反应的实验中,下列操作正确的是(  )
A.
先装药品,再检查装置的气密性
B.
先给装有Fe 2 O 3 的玻璃管加热,后通入CO,并点燃尾气
C.
先通入CO,紧接着加热玻璃管
D.
实验结束停止加热,继续通CO至玻璃管冷却
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举一反三
【单选题】增值税的零税率仅适用于()
A.
进口货物
B.
出口货物
C.
提供加工、修理修配劳务
D.
自来水、暖气、冷气
【单选题】听力原文:M: What time does the library close? W: On Monday, Wednesday, and Friday, it closes at 5:00 p.m.. On Tuesday and Thursday, it opens till nine. It stays open until six on Saturday, but on Sunday i...
A.
Monday, Wednesday, and Friday.
B.
Tuesday and Saturday.
C.
Saturday and Sunday.
D.
Tuesday and Thursday.
【判断题】I like this red lovely bicycle.()
A.
正确
B.
错误
【判断题】The third closing entry is to close Owner's Capital to the Owner's Withdrawals account.
A.
正确
B.
错误
【单选题】narta:I like the red shirt than the black one. Allen:Really?__________?Malta:The red one is longer and a little looser SO it will be more comfortable.
A.
How come
B.
Why not
C.
How much
D.
So what
【单选题】某投资方案,当折现率为16% 时,其净现值为338元,当折现率为18% 时,其净现值为-22元。该方案的内含报酬率为( )
A.
15. 88%
B.
16. 12%
C.
17. 88%
D.
18. 14%
【单选题】将低压电源负极与低压蓄电池( )连接,并紧固螺丝
A.
负极
B.
正极
C.
接地
D.
正负极均可
【单选题】二阶系统传递函数分母多项式为零,下列哪种情况系统稳定()
A.
两个实根,且都是负值
B.
一对共轭虚根
C.
共轭复根有正实部
D.
共轭复根有负实部
【单选题】选择题:若要组成输出电压可调、最大输出电流为3A的直流稳压电源,则应采用 。
A.
电容滤波稳压管稳压电路
B.
电感滤波稳压管稳压电路
C.
电容滤波串联型稳压电路
D.
电感滤波串联型稳压电路
【单选题】—Do you know the girl _______ red? —Yes, she is my cousin. I think red looks beautiful______ her.
A.
in, in
B.
wears, on
C.
wears, in
D.
in, on
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