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【单选题】
厚朴酚的结构属于()A.
香豆素
B.
木质素
C.
苷类
D.
黄酮类
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举一反三
【单选题】下列关于直流电机的电动势的表达式正确的是______。(其中,CE--电机结构常数;Ia--电枢电流;T--电机电磁转矩;Φ--电机主磁极磁通;n--电机转速)
A.
E=CETΦ
B.
E=CEIaΦ
C.
E=CEnΦ
D.
E=CEnIa
【单选题】We don't know what the surface of Venus might ______.
A.
look as
B.
look like
C.
look over
D.
look about
【单选题】“I her a long time ago,” he doubted, “She doesn’t look at all familiar.”
A.
might have met
B.
should have met
C.
might meet
D.
should meet
【单选题】下列关于直流电机的电动势的表达式正确的是（）。（其中，KE--电机结构常数；Ia--电枢电流；T--电机电磁转矩；Φ--电机主磁极磁通；n--电机转速）
A.
E=KETΦ
B.
E=KEIaΦ
C.
E=KEnΦ
D.
E=KEnIa
【单选题】_______ he’d come to the door, he thought he might as well go in with the others to have a look.
A.
Now that
B.
However
C.
Although
D.
If
【单选题】If he had worked hard____.
A.
he might have passed the final exam
B.
he might pass the final exam
C.
he has passed the final exam
D.
he passed the final exam
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