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【单选题】
取某药物适量,加水溶解,加氢氧化钠试液使溶液显碱性,即析出白色沉淀,加热沉淀变为油状物,继续加热,则可产生使红色石蕊试纸变蓝的气体,关于该鉴别反应说法不正确的是A.
该药物是盐酸普鲁卡因
B.
“油状物”为普鲁卡因
C.
“白色沉淀“为普鲁卡因
D.
“气体”为二乙胺
E.
该药物属于对氨基苯甲酸酯类药物
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【单选题】电容式液位计是通过电容传感器把液位转换为电容量的变化，然后再通过测量电容量来求知液位，因而这种液位计（）。
A.
只能测量导电液体的液位
B.
只能测量非导电液体的液位
C.
根据传感器形式的不同既可测量导电液体的液位，也可测量非导电液体的液位
D.
只能测量介电常数较大的液体的液位
【单选题】听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash-landing at night in the deep snow of Newfoundl...
A.
No fuel.
B.
Ice on the wing.
C.
Engine trouble.
D.
No food.
【单选题】听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash landing at night in the deep snow of Newfoundl...
A.
No fuel.
B.
Ice on the wing.
C.
Engine trouble.
D.
No food.
【简答题】若要使摩擦轮传动能够正常工作,必须使两轮之间产生的 大于从动轮上的 。
【简答题】若使摩擦轮传动能够正常工作,必须使两轮之间产生的 足以克服从动轮上的 。
【单选题】Twenty-six journalists from 19 media organizations of different countries and regions are the first ones_______ the unrest of “the Red-shirts” in Tailand capital.
A.
covered
B.
covers
C.
to cover
D.
covering
【单选题】听力原文： Captain Joseph Mackey's airplane was flying over the ocean on its way to Great Britain when engine trouble started. He turned back and made a crash-landing at night in the deep snow of Newfoundl...
A.
No fuel.
B.
Ice on the wing.
C.
Engine trouble.
D.
No food.
【单选题】Captain Sentry retired to the country because he was ______.
A.
bitter about his rank
B.
Sir Roger's heir
C.
too modest to be noticed by his superiors
D.
accustomed to obeying people above him
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