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【单选题】
检查,若溶液管与对照液管颜色的色调不一致,或所呈硫氰酸铁颜色很浅不便于比较观察时,处理的方法应为 ( )。
A.
加热浓缩
B.
多加硫氰酸铵试液
C.
降低溶液酸度
D.
加入正丁醇或异戊醇将呈色的硫氰酸铁提取分离
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参考答案:
举一反三
【单选题】We can put the napkin _______ when we want to leave the table for a while.
A.
under the plate
B.
on the chair
C.
beside the plate
D.
on our lap
【单选题】下列各式中,计算结果等于x 6 的是(  )
A.
x 7 ÷x
B.
x 3 +x 3
C.
x 3 ?x 2
D.
(x 3 ) 3
【单选题】Jim suggested that their Christmas gifts ___ and kept a while.
A.
put away
B.
be put away
C.
to be put away
D.
to put away
【单选题】对于式子(-3) 6 与-3 6 ,下列说法中,正确的是(  )
A.
它们的意义相同
B.
它们的结果相同
C.
它们的意义不同,结果相等
D.
它们的意义不同,结果也不相等
【单选题】下列算式中,结果不等于6 6 的是 [     ]
A.
(2 2 ×3 2 ) 3
B.
(2×6 2 )×(3×6 3 )
C.
6 3 +6 3
D.
(2 2 ) 3 ×(3 3 ) 2
【单选题】下列各式中计算结果等于2x 6 的是 [     ]
A.
x 3 +x 3
B.
(2x 3 ) 2
C.
2x 3 ·x 2
D.
2x 7 ÷x
【单选题】According to the author, we shouldn't neglect ______ while others put too much stress on gender differences.
A.
gender similarities
B.
gender roles
C.
the free will of us
D.
the effect of learning
【单选题】As soon as we arrived at the campsite, we erected our tent.
A.
put up
B.
put out
C.
put up with
D.
put off
【简答题】下列各式中计算结果等于2x 6 的是(  ) A.x 3 +x 3 B.(2x 3 ) 2 C.2x 3 ?x 2 D.2x 7 ÷x
【单选题】We bought the big house with the saving we had. for several years.
A.
put aside
B.
put off
C.
put down
D.
put in
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