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【单选题】
按的规定，工业用酒精和过氧化钠分别属于（ ）。A.
3类；5.2类
B.
4类；5.1类
C.
3类；5.1类
D.
7类；第8类
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【简答题】Some researchers can not test their hypotheses by experiments because of ______.
【简答题】For what a purpose did the researchers use raw potato starch in their experiment?
【单选题】The Columbia University researchers are the first to use sea-surface temperatures to match the past El Nino occurrences.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Some researchers have undertaken some psychological studies which prove that many children develop fears of ______ dangers.
A.
imagination
B.
imaginary
C.
imaginable
D.
imaginative
【单选题】Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some (1)_____ by the position of the Sun. Others navigate by the stars. Some use the Sun as (2)___...
A.
move
B.
fly
C.
steer
D.
swim
【简答题】如题图为谐振功率放大器的电路图。其中，电容C 0 为旁路电容，R 1 为产生自偏压的电阻，RFC为高频扼流圈，R 1 为负载电阻，LC回路谐振于输入信号v i (t)的频率f c 。若晶体管的转移特性如题图所示，输入信号v i (t)=V im cos2πf c t。已知晶体管集电极电流余弦脉冲的峰值为20mA，流通角为60°，试计算自偏压V B 的值、电阻R 1 的值、输入电压的幅度V im 和...
【简答题】The way a lot of researchers use to study anxiety is by ______.
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