【判断题】【消耗次数：1】
苯妥英钠可与吡啶-硫酸铜试液显绿色的药物
①
正确
②
错误
参考答案：
复制
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相关题目
【单选题】
提纯粗硫酸铜，平行测定五次，得平均含量为78.54％，若真实值为79.01％，则78.54%－79.01% = -0.47%为
①
标准偏差
②
相对偏差
③
绝对误差
④
相对误差
【单选题】
下列叙述中正确的是（ ）。①锌跟稀硫酸制取氢气，加入少量硫酸铜溶液能加快反应速率 ②镀层破坏后，白铁（镀锌的铁）比马口铁（镀锡的铁）更易腐蚀 ③钢铁表面常易锈蚀生成<img class="kfformula" src="20200629/1593420730606348.png" data-latex="{Fe}_{2}{O}_{3}\cdot {H}_{2}O" width="105" height="31"/>
①
②③
②
①
③
都正确
④
①③
随机题目
【单选题】
My camera can be _____ to take pictures in cloudy or sunny conditions.
①
adapted
②
adapt
③
regulate
④
coordinate
【单选题】
3. We cannot get an answeryet, for_______to that prob1em is stil1 underdiscussion.
①
action
②
strategy
③
solution
④
impact
【单选题】
4.Scientists didn’t know much about lung cancer ______.
①
before long
②
until recently
③
long before
④
in the past few years
【单选题】
1.Gates open at 10.30am and _______ is free.
①
admission
②
admit
③
admitting
④
admitted
【单选题】
4. The body can’t storevitamin C. So it is_________ to have a fresh supply every day.
①
essential
②
visible
③
ultimate
④
profound
【单选题】
8.Do you have any idea what he meant? I really can’t ______ what he said at this morning’s meeting.
①
figure on
②
figure out
③
find out
④
find
【单选题】
7. The fall in price is directly ______ to the increase in output.
①
concerned
②
connected
③
related
④
united
【单选题】
10.We should see ourselves as part of nature rather than in ______ with it.
①
argument
②
connection
③
conflict
④
crash
【单选题】
14.Anyone can borrow magazines from the club ______ he returns them in a week.
①
as long as
②
so that
③
unless
④
as far as