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【单选题】
三相异步电动机的同步转速由( )决定A.
电源频率
B.
磁极对数
C.
电源频率和磁极对数
D.
转子电流频率
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举一反三
【单选题】What happened to the man's Chinese teacher?
A.
His Chinese teacher was sick.
B.
His Chinese teacher was busy.
C.
His Chinese teacher was bad.
【单选题】某高危孕妇,孕35周,医生需要了解胎盘功能,下列哪项不能测定胎盘功能( )
A.
卵磷脂/鞘磷脂比值测定
B.
胎儿电子监护
C.
胎动计数
D.
盆腔B超
E.
雌三醇测定
【单选题】Which statement is not true about Catherine and her students in the movie?
A.
The students were hardworking.
B.
She needed to teach them out of the textbooks.
C.
The students were hostile towards Catherine.
D.
Well-prepared students could be a little bit intimidating.
【单选题】—He isn’t a teacher and his brother isn’t a teacher, either. —You mean neither he nor his brother . a teacher, right?
A.
is
B.
be
C.
are
D.
was
【单选题】The movie is about a true story ______ happened in Tang Shan in 1976.
A.
where
B.
which
C.
what
D.
when
【单选题】A) A math teacher and his colleague. B) A teacher and his student. C) A student and his classmate. D) A librarian and a student.
A.
A math teacher and his colleague.
B.
A teacher and his student.
C.
A student and his classmate.
D.
A librarian and a student.
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