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【单选题】
下列叙述中哪项与芬太尼不符A.
是改造哌替啶的结构中得到的镇痛药
B.
镇痛作用出现的较快, 持续时间较短
C.
镇痛效力强, 成瘾性弱
D.
约有 10% 的药物以原型自肾脏排出
E.
用于麻醉前给药及诱导麻醉
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举一反三
【单选题】Since the early 1990s, conservationists have______protecting the Amazon in part because of its abundance of plant and animal species.
A.
called forth
B.
called back
C.
called up
D.
called for
【单选题】学校里一块新停车场的机会成本是( )
A.
由此引发的所有的费用
B.
有用于其他用途产生的最大价值来决定
C.
用于建造车厂的机器设备折旧来决定
D.
由在停车场停车所需的费用来决定
【单选题】学校里一块新停车场的机会成本是( )
A.
由此引发的所有费用
B.
由于其他用途产生的最大价值来决定
C.
用于建造车场的机器设备折旧来决定
D.
由在停车场所需的费用来决定
【单选题】The Internet, as _____ means of communication, has been popular since _____ early 1990s. [ ]
A.
a ; the
B.
a ; /
C.
a ; an
D.
the ; an
【单选题】In addition to the farming they ______ since the 1990s, the Smiths have started a small business.
A.
have done
B.
had been done
C.
were doing
D.
have been doing
【简答题】Since the beginning of the 1990s, Shanghai has undergone great changes and has taken on a new look.
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