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【多选题】
下列属于仪器分析中的电分析方法的是（）。A.
以半导体-氧化物为敏感材料的酒精气体传感器
B.
极谱法
C.
可视化检测
D.
原子发射光谱
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举一反三
【简答题】若AX=3500H,CX=56B8H,当AND AX,CX指令执行后,AX=() A1400H B77F8H C0000H D0FFFFH
【单选题】Without a (an) ______ passport a tourist is forbidden to enter a country.
A.
operative
B.
effective
C.
valid
D.
efficient
【单选题】It is said that the agreement ______ between the two companies last month will become effective from May 1st.
A.
to sign
B.
signed
C.
to be signed
D.
signing
【单选题】The lecture is so attractive that the audience are listening_________.
A.
attentively
B.
anxiously
C.
effectively
D.
absolutely
【单选题】The main topic of the passage is ______.
A.
laughter and physical exercise have similar effects on the human body
B.
smile can produce the same effects as laughter
C.
pain can be reduced by laughter
D.
laughter is the best medicine
【简答题】有效的,生效的 effe_______ adj.
【单选题】Advertising is often the most _______ method of promotion.
A.
efficient
B.
efficiency
C.
effect
D.
effective
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