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【单选题】
间接碘量法测定植物油中的碘价时,淀粉指示剂应( )A.
滴定开始前
B.
滴定至近终点时
C.
滴定至红棕色褪尽至无色时
D.
滴定开始后
E.
以上都对
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皮皮学刷刷变学霸
举一反三
【单选题】比重瓶试验中，测得瓶质量为36.344g，瓶+土质量为51.272g，瓶+液体质量为138.124g，瓶、液体、土总质量为147.626g,该试验所测比重为（ ）已知液体比重为0.997。
A.
2.751
B.
2.694
C.
1.411
D.
2.743
【简答题】In the experiment we kept a watchful eye ________ the developments and recorded every detail. A) in B) at C) for D) on
【单选题】The old man kept on studying Chairman Mao’s ___ in his ___.
A.
work . sixty
B.
novels, sixtieth
C.
works, sixties
D.
books, sixty’s
【单选题】I kept looking at the man wearing a pair of glasses, wondering ________.
A.
whether did I borrow his book
B.
where I had seen him before
C.
what I knew his wife
D.
when had I helped him
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