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【单选题】
盐酸普鲁卡因易被氧化变色是由于A.
盐酸普鲁卡因分子中有叔氨基
B.
盐酸普鲁卡因分子中有氨基
C.
盐酸普鲁卡因分子中有芳伯氨基
D.
盐酸普鲁卡因分子中有酯键
E.
盐酸普鲁卡因分子中有酰胺键
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皮皮学刷刷变学霸
举一反三
【单选题】They soon began to investigate the cause of the fire.
A.
affirm
B.
invent
C.
examine
D.
deny
【简答题】.A fire broke out in a neighbouring street yesterday,but it was soon_______by the firemen. A,gone out B, put out C,given out D,made out
【单选题】As a duty engineer, as soon as your hear the fire emergency signal, you should ensure that the
A.
ring buoys are thrown overboard
B.
engines are stopped
C.
fire pumps are started
D.
life preservers have been issued to everyone
【单选题】The firemen arrived ___ the fire broke out.
A.
soon after
B.
before long
C.
long before
D.
after soon
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