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【单选题】
ZD6型电动转辙机中，旧型电机的单定子工作电阻为（）A.
（2.85±0.14）×2Ω
B.
（2.65±0.14）×3Ω
C.
5.1±0.245Ω
D.
4.9±0.245Ω
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【单选题】The researchers have tested their spray in the lungs.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】The researchers have conducted an experiment to prove that people will act in emergencies when ______ A) they are in pairs B) they are in groups C) they are alone D) they are with their friends
【单选题】After years of ______ bee dancing, the scientist found that the dances have certain patterns.
A.
gazing
B.
watching
C.
observing
D.
viewing
【简答题】The researchers have just completed a study of driving situations.
【单选题】The researchers have conducted an experiment to prove that people will act in emergencies when______.
A.
they are in pairs
B.
they are in groups
C.
they are alone
D.
they are with their friends
【单选题】According to the researchers, the traditional treatment for bee stings is ______.
A.
widespread
B.
extremely harmful
C.
almost futile
D.
sensitizing
【单选题】The sentence in the ninth paragraph, 'researchers are not likely to have anything resembling a blood test for a mental illness soon'means that_____.
A.
mental illness can not be diagnosed by blood test.
B.
there is not a definite criterion for mental illness.
C.
researchers do not like to use blood test.
D.
techniques have gained enough progress but are still not enough for mental illness.
【单选题】以下描述是正确的是
A.
浮地电源直接由实地电源提供
B.
浮地电路和实地电路物理上完全隔离
C.
浮地电源和实地电源的参考点是等电位的
D.
实地电源由交流电源提供，浮地电源由直流电源提供
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