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【简答题】
Standing sound waves are produced in a pipe that is 1.20 m long. For the fundamental and first two overtones, determine the locations along the pipe (measured from the left end) of the displacement nodes and the pressure nodes if the pipe is closed at the left end and open at the right end.
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举一反三
【单选题】.须予以隔离治疗的患者是
A.
鼠疫、霍乱和炭疽
B.
甲类传染病人和病原携带者、乙类传染病病人中的艾滋病病人、炭疽中的肺炭疽病人
C.
对疑似甲类传染病病人
D.
对除了艾滋病病人、肺炭疽患者以外的乙、丙类
【简答题】按工艺过程的特点,可以把制造性生产分成( )生产和( )生产两种。
【单选题】须予以隔离治疗的患者是
A.
鼠疫、霍乱和肺炭疽
B.
甲类传染病人和病原携带者、乙类传染病病人中的艾滋病病人、炭疽中的肺炭疽病人
C.
对疑似甲类传染病病人
D.
对除了艾滋病病人、肺炭疽患者以外的乙、丙类
E.
病毒性肝炎、流行性感冒
【单选题】— You should have told her about the meaning of the gesture. — I meant ______, but I had some unexpected guests.
A.
to do
B.
to have
C.
doing
D.
doing so
【单选题】How nice to see you again! You should have told me you ______.
A.
are coming
B.
were coming
C.
will come
D.
have come
【单选题】须予以隔离治疗的患者是
A.
鼠疫、霍乱和炭疽
B.
甲类传染病人和病原携带者、乙类传染病病人中的艾滋病病人、炭疽中的肺炭疽病人
C.
对疑得甲类传染病病人
D.
对除了艾滋病病人、肺炭疽患者以外的乙类
E.
丙类传染病病人
【单选题】You should have told me there was no meeting today, I ___ have run all the way here through the heavy rain.
A.
can’t
B.
mustn’t
C.
shouldn’t
D.
needn’t
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