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【判断题】
空白试验是指用纯水代替样品，其它所加试剂和操作步骤均与样品测定完全相同，空白试验与样品测定不用同时进行。A.
正确
B.
错误
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参考解析：
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举一反三
【单选题】Mr. LuXun died in 1936. He _______ a lot of famous novels. A. wrote B. was writing C. has written D. would write
A.
wrote
B.
was writing
C.
has written
D.
would write
【单选题】炼铁选用的铁矿石不仅要求含铁量高，而且要“有害元素”少．今有铁矿石：黄铁矿（FeS 2 ）、菱铁矿（FeCO 3 ）、赤铁矿（Fe 2 O 3 ）、褐铁矿（2Fe 2 O 3 ?3H 2 O）、磁铁矿（Fe 3 O 4 ），你认为不适宜炼铁的矿石应是（ ）
A.
黄铁矿
B.
菱铁矿
C.
赤铁矿
D.
磁铁矿
【多选题】已知逻辑函数 的真值下表所示, 的逻辑函数式为。( )
A.
A’B’C’D+A’B’CD’+A’BC’D’+A’BCD+AB’C’D’+AB’CD+ABC’D+ABCD’
B.
A’B’C’D’+A’B’CD’+A’BC’D’+A’BCD+AB’C’D’+AB’CD+ABC’D+ABCD’
C.
A’B’D’+A’B’C+B’CD+A’CD+AB’C’D’ +ABC’D+ABCD’
D.
A’B’D+A’B’C+B’CD+A’CD+AB’C’D’ +ABC’D+ABCD’
【简答题】高炉冶炼对铁矿石的要求是什么?
【单选题】This is ______ Luxun Park, and Mr. Green is ______ head of ______ park.
A.
the/X/the
B.
a/a/the
C.
X/the(X)/the
【单选题】Mr. Smith __________ the accident，but his wife died and he __________ her by five years.
A.
survived from；survived
B.
survived of；lived
C.
survived；survived
D.
survived；lived
【简答题】炼铁生产对铁矿石的质量要求是什么?
【简答题】高炉冶炼对铁矿石的要求是什么？
【单选题】— I haven't met Mr. Brown for ages. — Oh, he _____ for two years. [ ]
A.
has died
B.
died
C.
has been dead
D.
has been died
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