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【单选题】
三相电源相电压之间的相位差是120°,线电压之间的相位差是 。A.
90°
B.
180°
C.
120°
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反馈参考答案：
举一反三
【单选题】________, he had asked three persons before he got there.
A.
Not knowing where was the bookstore
B.
Knowing not where the bookstore was
C.
Not knowing where the bookstore was
D.
Not to know where the bookstore was
【单选题】______, he had asked three persons before he got there.
A.
Not knowing where was the bookstore
B.
Not knowing where the bookstore was
C.
Knowing not where the bookstore was
D.
Not to know where the book store was
【单选题】He asked the three men –Bob, Joe and _____ to be ready.
A.
I
B.
himself
C.
me
D.
herself
【单选题】有关连续划线分离法正确的是
A.
此法主要用于杂菌多的标本
B.
取多量标本接种
C.
于平板1／2处密集涂布
D.
局部密集涂布后，来回作曲线连续划线
E.
线与线间应有交叉
【单选题】有关连续划线分离法正确的是
A.
此法主要用于杂菌多的标本
B.
取多量标本接种
C.
于平板1/2处密集涂布
D.
密集涂布后，来回作曲线连续划线
E.
线与线间应有交叉
【单选题】He has asked three classmates for a certain answer but has a different reply.
A.
each
B.
either
C.
none
D.
neither
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