【判断题】【消耗次数：1】
配制亚铁盐时要加少量酸使其稳定
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
在为制冷系统重新加制冷剂时，系统要先抽真空，是因为
①
防止系统空气中的水分在膨胀阀处结冰
②
为了给系统多加注制冷剂
③
为了将系统中的残余的制冷剂排净
④
为了更容易向系统加入制冷剂
随机题目
【单选题】
She always put her medication on the top of the
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①
took
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should take
③
had taken
④
would take
【单选题】
Evidence came up ____ specific sounds are recognized by babies as young as six months old.
①
what
②
that
③
which
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whose
【单选题】
There will be a new building here next year, _____ ?
①
will it
②
will there
③
be there
④
won’ t there
【单选题】
This house will probably come on the ____ next month.
①
fair
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market
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shop
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store
【单选题】
I’m sure your suggestion will ____ the problem.
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contribute to solving
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be contributed to solve
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contribute to solve
④
be contributed to solving
【单选题】
____ before, his first performance for the amateur dramatic group was a success.
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Though having never acted
②
As he had never acted
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Despite he had never acted
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In spite of his never having acted
【单选题】
“If we fail to act now,” said Tom, “We’ll find ourselves ____ in action later on.”
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paid back
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paid for
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paid up
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paid off
【单选题】
The statement had to be delivered to someone who could
____ it to the press.
①
relieve
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release
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emit
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discharge
【单选题】
When the idea of winning in sports is carried to excess, ____ competition can turn into disorder and violence.
①
honestly
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honest
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honorable
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honorary
【单选题】
He had acquired a（n）____ command of the English
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ordinary
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immense
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extraordinary
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temporary